Not in my life.
Id rather get a MB and save some cash, or upgrade to a faster MBP for just a little more.
The MBP and MB are thin enough for me. I mean really, when Im sliding it into my bag, I dont care about a few CMs more space. The one advantage it has IMO is WEIGHT. It is nice and light. But why would I pay MORE for that! It should be like $200 cheaper than the MB IMO. I would consider it then, to be my portable daily machine. The price is the ridiculous part.