don't ever leave camera equipment or anything else in a stroller unless you don't mind losing it
let me give you an idea of what I was carrying in one fanny pack - one preview normal sixed camera wrapped in bubble paper and kept in a ziplock bag, three extra rolls of film - one camcorder trv 33 pretty small camcorder wrapped in bubble paper and in a ziplock bag, two large Brita water bottles, a mister, three extra mini dv tapes, wallet, all passes/room keys, three ponchos, key to room safe, and 30 page print out of different rides printed on 8 x 11 paper... all in one fanny pack.
and there was no problem getting on any ride, space mountain, splash mountain, thunder mountain, etc etc... the new Mission Space has a storage place for your stuff ... kali river rapids has a center storage place in the ride...space mountains cars are pewny but having all that stuff and my hat and sunglasses stashed was no problem...
aas far as I can tell as long as your stuff is fairly consolidated...not in 4 bags... then you should have no problem unless you have just a huge camera/camcorder outfit.