I would compare it to learning to drive manual transmission. Difficult to get used to at first, but once you've mastered it, automatic will feel awkward and unsafe.
The act of typing a single word, as opposed to browsing through menus of categories and programs, saves me at least 10-15 seconds each time I have to access a program. The only icons I keep in the launcher are Chrome, Terminal, Home, Inkscape and Gimp.
Same for documents. Starting Nautilus, clicking through to a bunch of folders, maybe going back a few times if I took the wrong path is significantly slower for me than just typing a keyword and getting maybe 5 or 6 results one of which is the document I was looking for.
I find this is similar to the functionality of the Spotlight search on the Mac which I also enjoyed.
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).
I still had to modify gkrc(GKT2.0) for my Eclipse SWT tooltips
And of course most of the time I am using CairoDock anyway