Expose + Spaces was such a brilliant workflow. Then some jack*** at Apple decided he wanted to do it differently, so they force this new crap on us. It's completely ridiculous to not make it an option to use Expose + Spaces.
In Snow Leopard, I press fn + F3 and IMMEDIATELY, I see every single window I have open. Super fast, I got into a great rhythm with it.
With Lion, I press F3 and I can see every window open. But...
If I have windows open in another Desktop, all I see is a small, unexpanded thumbnail of that desktop. Cycling through 10 desktops is a pain. Sure if you had 10 desktops with Spaces, they previews were small, but MUCH larger than Mission Control.
If I have more then 3 windows open for a certain application, I just see a stack of windows. This doesn't help me. At all.
I know I can expose the application windows, or expand the stack, but its just another annoying step I don't want to have to deal with.
My biggest point: Expose + Spaces became like a reflex, and I hardly had to think about it. Mission Control is close to the same thing, but the little differences make for headaches, and take me out of my workflow.
I'm on Mountain Lion, and will probably bail on Apple after this laptop. Their mentality of "we will tell you the best way to work, and you'll do what we say" is just pathetic and frustrating.