I have used 3 different tripods in Disney. A tiny little table top that didn't hold my D50 well at all (I think I used that one only twice). A $20 travel tripod from amazon.com that I used the most (Wishes 4 different times, Illuminations, night shots around the World Showcase and MK and also for waterfall shots in AK and night shots at AK). Lastly was one of the full size cheepo $40 tripods from Wally World, or
Best Buy or places like that.
The full size one was great. It extended high (I think about 62" IIRC), but it was a pain to carry around. It folds up to about 24" long and isn't the easiest to cart around, even with a stroller. It also was a bit wobbly. It held my D50 and 18-70 or 18-135mm lens with out much of an issue, other than its a cheep tripod.
The $20 travel tripod I got from
amazon was the best. It only extended to 43", but that was juuuust enough to see over the railings at EPCOT and AK. It was sturdy enough to hold my D50 and 18-70 or 18-135mm lens, though I did have to position the legs so 1 leg wasl always under the lens. It is VERY light weight and folds up to 13.5" which fits perfectly in my backpack. I got some great shots with it on 2 different trips. When it is in the open position, but with the legs not extended out, it fits perfectly on top of the trash cans around Disney and the LCD comes out just about at eye level for someone who is 6' tall like me.
Our next trip (when ever that may be) I will take the travel tripod again, but I'll also take my Manfrotto tripod. Its heavy and big, but I have a carrying case for it so I can sling it around my shoulder. Don't know which one I'll use more. Depends on what else we're carting around. The Manfrotto tripod I'll also use as a monopod if I need it.
My take on monopods for Disney is that they act like a VR or IS lens would. They're not good for any exposure longer than 1/10th or so. They would come in handy in AK when using a long lens that doesn't have IS or VR and also for the Osborne Lights at DHS if your going during the x-mas holiday season. For fireworks I wouldn't bother. I like my fireworks shots to be upwards of 10 seconds. A monopod wont help there.
A gorillapod can be useful for a dSLR, just be sure to get the one made to hold a dSLR. You can use it on a trash can, though I don't know if I would use it wrapped around a fence unless you play around with it a lot before you go and are completely comfortable with holding your dSLR.