I've never experienced that disquiet, and it worries me. I read Brave New World and while the unnecessary torment of the Gammas and Deltas bothered me, my only thought about the lifestyle of the doped-up, lavishly entertained, socially and physically secure Alphas and Betas was "Awesome! Can't wait." Same thing with the Experience Machine -- if you really could lock everyone who wanted one into their own personal optimal-experience simulator, where the only catch was that it wasn't "real," and we stipulate that the machine works as advertised, I'd sign up without much hesitation.

If somebody in real life offered that kind of opportunity, I'd turn it down, because we can't really be sure that it would work as advertised...but if we really think that life in one of these utopias would be an improvement over the status quo, what's to find disquieting?