I too would always book a window seat because I wanted to look out of the window during take off and landing. However, after several long haul flights where I've helped myself to far too much wine, I decided being hemmed in was no fun for me, my bladder and possibly my seat mates.

Now I much prefer the aisle seat - stretch my legs, get in and out of my seat with no issues and not have to wait for ages for the entire plane to disembark before I can get out. The only downside is when people grab onto my headrest as they walk or club my face with their oversized baggage as they squeeze through the aisle.