Of course, if you just want to launch programs by typing a word, you don't need Unity. You can just type their names into a terminal.
For me it's easier pressing the "Windows" key and just typing what I need. Not to mention that that key has regained its usefulness which, until Unity came around, hasn't been pressed since I stopped using Windows.
On a decent PC, you don't notice the delay anything like as much.
PS: before Unity, I just bound the Windows key so that it invoked dmenu (see 'suckless tools', dwm/dmenu for the minimalist approach to GUIs).
If there are problems on Atom or other processors then there definitely need to be some optimization done there.
If you forget to to this from now on, just hit ^Z (to suspend the process) then run `bg' (to put it in the background).