I've been to Orlando before, stayed in a villa with car hire with family when the dc were younger.
Would like to go back on my own with teen dd however I can't drive so we would rely on transport. Don't think we would do disney but universal (harry potter!) would be a must. Those who have been without car hire would you recommended an area/hotel?
Does the i-trolley actually go as far as the parks or just up and down I-drive.
Yes easily doable on international drive. I've stayed at coco keys water park hotel, pointe Orlando and a Hilton. All were good. The I trolley bus was great. It takes you up and down the length of international drive. Lots of hotel provide transport to universal and the water parks. We used taxi mini buses to disney they dropped us at the ferry across the lake from the main gate.
I found it really easy to get around Without a car and prefer doing the parks that way. We eat on the way back from the parks getting off the trolley bus where we fancied eating.