I can see your point. However, when I am stuck on Autopia, and some yahoo behind me keeps bumping into me, that's what I find the most uncomfortable. Also, as much as I love it, the canoes, since there's no back support.
I have never been brave enough to ride the Matterhorn Bobsleds. I have heard that the sleds are very bumpy. It's not that, that keeps me off of them, it's the fact that I am not fond of rollercoasters in general. I do ride BTMRR on occasion. That one is pretty short, and if I am with a group, I sometimes talk myself into riding.
Matterhorn and Splash both reak havoc on my lower back. The Matterhorn due to its bumpiness and sharp turns. Splash due to the final drop - those without back problems probably don't realize this but the logs hit the water on those drops HARD. I prefer the back seat because it offers better lower back support but it's not often I ride this ride due to this reason.
Autopia - great ride but you have to press the gas so hard it feels like your leg is going to break off.
RRCS is the absolute worst though. I'm a tall guy and when the ride spins my knees are constantly banging against the dash board. I always exit that ride with sore knees.
Splash Mountain, for leg room/major cramps of pain involved, or the Subs, which I refuse to ride after getting the half seat next to the staircase once. It was horrible...the regular seats are small for me, but that was literally a nightmare basically of uncomfortableness.
I'm only a puny 5'1'' so matterhorn, BTMRR and Indy does throw me around a bit xD But I still love all those rides regardless.
The Astro Orbiter is very hard for me to climb into and I tend to slide around alot, it kind of hurts my side when I go down but still, i dont mind too much