What don't you like about "big kid" rides?
I don't like drops, so I don't ride Tower of Terror or the Maliboomer and am not interested in Jumpin' Jellyfish. I rode California Screamin' once, but probably will not ride again. (I might give it a try at night if my good friend who loves thrill rides ever comes out from Florida.) I haven't been on GRR (being strapped in to a boat in the water worries me a bit but I saw a ride-through and it doesn't seem too bad). I think besides that I can ride anything, though.
I think if you are seriously debating whether or not to go on something you should give it a try, but if you are outright terrified of it, or you know the ride itself is basically only stuff you don't like, then there's no shame in sitting it out.
In most coasters, the back rows seem to move faster (not sure if that's how it really works because of physics or if it's just the feeling). Of course, the front row, you see exactly what's ahead. Middle rows might be best, unless you want/need to see where you are going.
The shortest (and IMO tamest) roller coaster would be Gadget's Go-Coaster in Toontown. About half of the ride is the lift hill; the whole thing takes less than a minute. It does have some kick to it but there aren't any scary drops--it's just a quick little ride (with very small cars, but two small-to-medium-sized adults can just fit). There is plenty to look at while you ride. (I'm not trying to disparage that roller coaster, though; I used to LOVE Gadget from Rescue Rangers and still have a certain fondness for the ride.

)
You might like Indiana Jones all right--it is VERY jerky, but no drops to take your stomach away, and it's very immersive. I had a good friend who was terrified to go on all thrill rides (from how she was going on about it, I was worried that Peter Pan's Flight might be too much for her!). But she ended up enjoying Indy quite a bit.
Big Thunder Mountain is my second-favorite and I don't think it's too bad--it is quite fast-moving and I think the longest coaster (besides California Screamin'). But there is a lot to look at so hopefully that would distract you. There are some curves that feel pretty fast, but the drops are pretty minor. I love the speed of mild coasters, so it's a great fit for me.
The Matterhorn can be really rough, but it's over 50 years old, so I have an easier time thinking of it as a tame ride (even though some 80 and 90-year-old wooden coasters have quite a kick

). If you are TERRIFIED of heights it may be a bad idea because it feels like you're quite high up. It's the only coaster in
Disneyland itself that I don't actually enjoy just because it's so rough. I find it uncomfortable/awkward to ride with two people in a car, but the cars are just too big for one person by her/himself and that makes the ride even jerkier.
Unlike most people, I find Splash Mountain to be the scariest ride in Disneyland proper because I do not like drops at all. The vast majority of the ride is tame, with I believe one minor drop and then the big one that will probably make you scream.

That said, if you feel that Pirates of the Caribbean has more than two "dips"/etc., you will probably find a lot more of Splash Mountain to be horrible, as the logs seem to float less smoothly than the larger boats on Pirates. (Pirates has two drops, both fairly minor by most definitions, though the first drop in Splash might be smaller than the two in Pirates; I'm not sure.)
I don't love the drops in Pirates either, but I've gotten to where I am fine with them.

My friend who was terrified of most thrill rides was fine with Pirates too.
Space Mountain is considered the scariest one in DL by many. I LOVE it and to me it has just one little dip that takes your stomach away just a tiny bit (two if you are in the back), which I find to be delightful. It's my favorite ride in the parks. My friend who was terrified of most thrill rides found it to be probably her worst experience at all of Disneyland, it sounds like--she was absolutely terrified by the ride. I'm not sure what she didn't like about it, though; perhaps a lot of the problem was being in the dark?
In DCA, I think the only coaster besides California Screamin' (which I'd avoid until you like the coasters of DL

) is Mulholland Madness. If you like little zippy rides it might be fun, but if you hate quick turns and/or drops I'd definitely avoid it, because it's basically all quick turns and drops. I found it kind of fun and kind of nauseating.

It's nothing like Gadget's Go-Coaster.
I don't know if you've done Soarin' or not but even if you're somewhat afraid of heights (as I am), it should be fine. It does not feel like you're high up at all, to me. The very first time I did it, I did not care for it much because I didn't know what to expect and so the slow banks/etc. worried me a little bit, but now that I have it "memorized" I have no problems with it.
If simulators in general don't bother you then Star Tours should be fine--the first couple times it's kind of trippy but at this point I find it almost boring and non-immersive.
Are there any other rides that worry you that you were thinking about riding?
I can't really advise on any motion sickness stuff. I went on a 2-hour or so cruise on a tall ship/sailing ship and was worried about motion sickness (since the Internet told me to worry

) so I had a little candied (food grade) ginger beforehand and I was fine. I have no idea if it actually had any effect or if I would've been fine anyway, though.
I'd love if you would post back about your experiences when you come back. I am always wondering how different people take different rides so I can better know what rides others might be able to ride.
