This sounds absolutely great, hope it's the same for me (haven't tried El Capitan yet)! On a rMBP with integrated graphics, moving from Mavericks to Yosemite made everything noticeably more sluggish, and everytime I happened to use Mavericks after that, I was struck by how responsive it was.
I have stayed on Mavericks for this reason. I likely will move to El Capitan, but I'll wait until the release and see what people say.
That would is of course always welcome. Can't say my early 2011 MBP with an SSD has ever felt underpowered on Yosemite though.