I'd say use it as well. We're just starting to use ours but I've already had more pure fun sewing on it than I've ever had before (though I haven't started doing actual projects on it yet.) The sense of connection and the level of control give me a level of confidence that I've never had with another machine (this doesn't apply to my wife, however!)
The other thing that I really enjoy is the rhythm. With an electric machine you start, stop, slow down, etc... instantly. That's fine but it feels somewhat herky-jerky to me. The treadle, on the other hand, rewards a steadier, more uniform pace - slowing and speeding up are OK but you don't want to let it stop - it's typically more than just a push of the foot to start up again - and it's easy to have it stop on you if you're going slowly and you aren't steady.