See Winnie the Pooh scared my kids.. there is a big thunderstorm in it and they hated that!
Peoplemover AKA Tomorrowland transit autroity has some fairly long dark spots in it. We brought glow lights for the kids to use the first couple of times... it really helped. It's now one of our favorite rides! Cool breeze, never a line, and great stuff to look at!
I would start with Dumbo.. Small world.. Merry go round... tea cups... Mickey's philharmagic... work your way up... dont try rides your not sure of if the child is tired, hungry, et all. lol
ditto on dumbo, small world, teas cups, carrousel.
philharmagic is LOUD and dark (and my kids hate the glasses),
winnie the pooh has thunderstorms and the "scary" woozles (our kids at 4 still don't care for the ride ,but they now love pirates of the carribbean?!?!..i truly think they got scarred at 2 y.o. by the ride!) TTA also has some dark and loud spots. buzz is loud, dark, and a bit scary to my kids.
glow sticks help my kids (i tell them to "look at the bright light" if they are uncomfortable with a dark ride), but i think the glow stick gives them a sense of courage, even more than a sense of comfort on the ride. we actually start a glow stick for each of them each morning and we let them hold them for any dark ride (we hold onto them for the rest of the time or they'd be lost in 30 mins!)
we also learned after trip #2 that my kids are very uncomfortable with/scared of loud noises, so we also bring earmuff/head phones to reduce the noise level. i don't think most kids have this problem, but you might just want to watch for any signs that your child is uncomfortable with the noise level so you can cover ears, if needed!
the train ride around the park is great, too.
2 y.o. is a fun, fun, fun age to take kids (even if they DON'T do lots of rides). have a great time!!
oh, i know some parents don't consider it, but world showcase at epcot is INCREDIBLY entertaining for toddlers...there is SO much to see and experience, and not just the kidcot stations(...we use that as a "last resort" to keep the kids occupied and rested, but i will warn you, SHARPIE sponsors the kidcot stations. if you are like me, you are asking, "what, SHARPIE?!?! as in the permanent marker manufacturer?!?" YES...PERMANENT markers for toddlers....arrggghhhh!!!!!!! )