I have the eTrex 30. I chose it because it is the lightest and has the longest battery life of the mapping Garmin GPS line. Really, my only complaint is that it takes so loooooooooong for the screen to re-draw when you pan to the next frame... I mean, maybe 10 seconds sometimes.
I also have the foreTrex 401. It straps onto your wrist, though you could remove the strap and put it in your pocket. Lighter and smaller than the eTrex 30. It does not have mapping, but in some ways I prefer the simplicity of just using coordinates to find my location on a paper map. Seeing where your are on the eTrex 30 map does not tell you a whole lot as the map on the screen is so small and by the time I have panned to see the surrounding area I have forgotten much of the general topography. There really is no substitute for the large view of a paper map when you need it.
On the other hand, there are times when traveling to new areas that paper maps are not available and the eTrex 30 map is much better than no map. And... I know it sounds strange, but in this scenario where you don't have a paper map and you're in a new area, there is some logic to taking both of my GPS units: If one fails and I don't have a map, it's nice to have the second... even if only to use it to retrace my steps.
I got my first GPS a bit reluctantly like you. But now that I've used them I think they're very useful... and very cool technology. I also thought I would just turn them on when I really needed it and mostly leave it off. However, I also found that if I didn't turn it on and use it a fair amount, I was not proficient at using it...especially the more complex features that come with the mapping eTrex 30 ... practice makes perfect, as they say.