Oh dear. Thank you all three of you for the replies, this is very informative. And may very well deter me from staying at POR. And it has nothing at all with wanting to be first on the bus while others have waited 20 minutes. (Though in the interest of fairness, I would point out that wheelchair/
ECV users are also the last OFF the bus and are often just leaving the ramp while able-bodied guests from that same bus are already through the turnstiles and starting their day, so it all comes out in the wash.) While I've absolutely no problem waiting my turn (I would even be perfectly content to wait for the next bus, if that's what was needed of me), it is important to me to not have to load the ECV into a bus full of people.
The one and only time that a driver had me do this, about 6 weeks ago on a bus from AK to Epcot, it was a horrible experience. The driver would not help me park it, and while I'm a proficient ECV driver, trying to parallel park the thing into that tiny space on the bus really is a nightmare, and not a quick or easy process. So many people on the bus were staring at me, giving me dirty looks, and rolling their eyes at me. It was completely humiliating. (It didn't help that the driver was also being really rude, huffing, puffing, and yelling at me.)
I'm a very shy girl, I absolutely hate being an inconvenience to anybody, even complete strangers, and if I saw seated people being made to stand to make room for me and my ECV, it would really put a damper on my day. As much as I love the Moderate resorts, and am dying to stay in a Royal room, I would rather stay in a Value with just one bus stop than ever put myself through that again.
So sadly, POR and CBR might just be off my wishlist for good. I'll have to really think about it now. Thank you again for your information. I'm so happy to have a helpful community like the DIS to come to with these kinds of questions!