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No, he's not crazy and neither are you. You don't need to root a phone and/or install a custom ROM to get better battery life. Disabling the cellular data feature (Mobile Data) is the key. Doing this does not disable the ability to make/receive phone calls. This is not the same thing as Airplane Mode, which disables all radios in the phone.
If your Android phone does not have a Mobile Data option that you can toggle off, get Quick Settings (a free app on the Market). Quick Settings can live in the top Notification bar and it allows you to toggle/change many settings.
Another way to accomplish almost the same thing is simply to turn WiFi on. This will by default turn off Mobile Data. Although the WiFi radio will draw some current, even when not connected, the overall battery savings vs leaving Mobile Data on is huge.
Since I have WiFi at work, I often turn on WiFi on the phone while I'm there. This way, I still get email and such via WiFi, while saving battery. I often use the phone as an MP3 player, so the WiFi trick helps quite a bit.
Joe
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