for me it would be Splash. i remember like 9 or so years ago, we were there in Jan. and we could stay on all the rides over and over. we had a great week , that spoiled us.
I have a few rides that I drag my fiance on OVER and OVER again, lol. Normally we'll do The Great Movie ride, The Haunted Mansion and the Transit Authority (People Mover) many times! I guess because they're relaxing and you can just enjoy the ride!
I'll tell you what. Long, hot Florida afternoon in August, I can sprawl out on Transit Authority with a cold bottle of water and ride it a dozen times in a row and still not want to get off. I think the tag ferry picked up on that