I also miss the grid layout of spaces. In fact, I'm considering downgrading back to Snow Leopard just to get it back. I used to use command+arrow keys to move around in my grid of spaces. I used to use a hot corner to initiate spaces, then another hot corner to initiate expose while "zoomed out" in spaces. I used to be able to click any window of any app in any space and move it to any other space. I used to be able to move an entire space to another location.
Now I've upgraded to Lion and I cannot do any of that. Serious downgrade, serious loss of efficiency. I've taken the time to learn how Lion handles all this. I've taken the time to change options to try to make MC more efficient. Simply put, it's a downgrade that breaks something great from Snow Leopard.
For example: Initiate Mission Control while on desktop 1 and I see a window on desktop 2 that I want on desktop 3. In order to move that, I have to first switch to desktop 2, initiate MC, then move the app. Not to mention, if that window were under another window, I'd not be able to see it at all!
For example: In SL, to go from space 1 to 9 on a 3x3 layout, I could use command+right, down, down, right. On Lion, I have to use comand+right, right, right, right, right, right, right, right. seriously? Sure, I could use command+9 (if that's even where Lion decided it wanted to keep the app!), but I prefer the efficiency of using 1 hand to do the keyboard shortcut.
Tell Apple you want the option of having spaces in a grid again. Who knows, maybe if enough of us do, they'll bring it back: http://www.apple.com/feedback/macosx.html
Message was edited for grammar by: pistolpete_sf