Smart phones add so much value. In fact, I think it would be hard for most who have lived through the iphone age to go back to the world before. Almost like going back to the times before electricity :-)
I didn't like being connected all the time, it wasn't healthy for me.
I guess that you still have to have the discipline not to connect wifi, but I don't think that would be too much of an issue. Disabling/enabling wifi on Android is fairly easy. This barrier, though small is probably enough to help keep you in-check.
It's probably time to start grabbing old phones off of eBay.
But I agree they are fantastic, except the prices for the high end are usually ridiculous.