I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
Once in awhile (a few times a day) I manually check my running apps and close any I don't expect to use again that day. I reboot about once a day just for the heck of it. Every few days to once a week I reprogram my roaming with *228
I don't use automatic task killers. When I tried them they didn't make any difference that I could tell. And if battery life is an issue there are better ways to get more battery life than killing tasks.
Make sure to uninstall any apps you don't use (except factory installed, obviously), and stay away from app killers, especially their automatic setting. When you do install new apps, make sure you do so one at a time. This way, if you come across a bad app, you will have a better chance to know which one it is. The occasional reboot doesn't hurt, but, imho doesn't really help. Turning off GPS, Bluetooth, WiFi, and even mobile data when not in use, or in a bad reception area will help improve battery life, however, it is a smartphone and the battery life will never be spectacular.