I guess the real question is, how much time are people getting out of there battery versus how much more time are you looking to gain by turning off things like iMessage and the app store? To me, it doesn't make any sense if you in theory are gaining lets say an hour more overall. Unless your talking gains of half a day or more then it's not worth it. Turning any feature of the phone off is a modest gain at best not substantial.
If you use your phone all day and by time you get home it's at 20% or less, is that a bad thing? Or are people saying there phone is completely dead mid day and won't make it until the end.
We all use our phones differently therefore, our perspective's on good and poor battery life will be different. When I see posts like this seeking to gain more juice from the battery I have to ask just how much more and what are you getting now?