You have no idea what you're missing. I used to think the same thing before we got our first Tivo about 6 years ago. I always thought it sounded like a cool toy, but didn't think we'd use it much. Then my gf got a job in retail, and was always calling me last minute asking "can you tape this?" Then I'd start digging through tapes, trying to figure out what we had and hadn't watched already. I bit the bullet on a Tivo, and the rest is history.
A DVR truly changes the way you watch TV, and we don't even do as much time-shifting as many out there do. We set a lot of recordings "just in case". We intend to watch them live, but if we get caught up doing yard work or at the grocery store and don't get home in time, we don't have to worry about it. Or now with remote scheduling, I may hear about something new or remember that I forgot to set up a recording and do it right from my computer or cell phone. Maybe even more handy is the ability to pause and rewind. Go grab a beer or to the bathroom any time you want - no waiting for commercials. If the phone rings, simply hit pause, and pick back up when you're off the phone. I can't tell you how often we'll be watching TV and one of us will say "what did they say?" Rewind...
It seems so trivial, and I know what it's like to think you really don't need it, but everyone here will tell you that once you get one, you'll say "how did I ever live without this?"
We don't have a TV in our house with
out a DVR...

(and we routinely only set up 2 of them to record programs)