As for the flying uke's part ~ I'll take Ron's and Brent's word for it.
Nah, don't do that. If you get the opportunity take the ukemi for your self and see what you think. I just tried to supply some context.
Some times I enjoy (as uke) striving to give shite the best possible connection from my center to work with. Just to put things in the best possible way for shite to do the waza, and the best possible way for me to experience their power. I enjoy recieving it, especially from certain instructors and partners. It's a blast. These aren't "truly martial" interactions in a lot of cases...but they are aikido.
Other times I try to maintain my integrity, and let shite make all the connections on their own in terms of making the waza happen. It just depends on what seems called for, needed, desired, enjoyable etc at that moment. I can enjoy many different modes of keiko.
Doesn't mean you should take the pill...