I have a PC and I love Flash
Over the entire history of owning PC's both purchased and my own assembly from chosen parts, I have never had and problems with Flash.
It was not till around a year ago, when I started reading Mac Forums about the new Apple tablet that was coming that I even knew anyone on the planet had any issue with Flash whatsoever.
I saw it used everywhere, enjoyed the richness it brought to old boring static web sites and assumed everyone on any machine was enjoying it also.
I even tried Ubuntu a few years back and Flash played back fine on that.
It was, and is a non issue for me, and I gues for tens of millions of other people. You have a new machine, you go to a Flash website for the 1st time on your new machine, you click a button to download and install Flash, which you do and you never even think about it every again.
It just works.
I expect there are tens of millions of people out there who are like what I was like a year ago, and don't even know what the problem is, as for most people with computers there just is no problem.
As for power soaking. I have played back 1080p video from YouTube in the new format and also the exact same 1080p clip in, what Mac users sadly say is horrid flash, and the Flash version used considerably less CPU power to play back than the HTML5 version of the same video.
So, for me. how can I say anything other than, in my experience on all my machines I love Flash, as there is nothing else I can say.
If Apple had worked closely with Adobe from Day 1, instead of having childish battles with them. I'm sure the excellent Apple and Adobe programmers could of made Flash run even better on a Mac than it does on a PC.
The whole this is like watching a bunch of children and is sad.

It's only the consumers that suffer in the end.