I too thought the lack of in-seat power was a significant limitation. However, since flying on many airlines, aircraft and routes that do have in-seat power, I am surprised at how little I actually use it, and even then how little I actually needed it. I have found that I have used the in-seat power on QF, BA, CX, AA etc on maybe 5% of the flights it was available, and it was more for keeping the battery topped up just in case I needed it later and in almost all cases I could have run on battery power for the whole time I was using the device (combination of laptop and PocketPC).
I tend to consume copious quantities of water when flying (and sometimes too much other beverages
) so make regular trips to make space for more water. I think that would really annoy an aisle passenger if I was seated in a widow seat on QF dreamtime or Skybed aircraft. I am happy to take a window on AA's international business class as their extra 10 inches of pitch make it easy to get out from the window seat.
If you tend to remain seated for most of the flight, then the window is a comfortable place to be. That is why I particularly like the A seats on the QF 767-300 business class cabins.