I personally have no desire to ride any ride at WDW alone. Please understand that I've ridden most everything there dozens of times, and have them all practically memorized. The fun in them now for me is experiencing them with a friend or loved one (but that's also true for the first time on a ride). Earlier this month, when we exited from our first ride on Flight of Passage, we were all abuzz about the experience: how great it was, the different sensations given to the rider (and about how disappointing NRJ is). Doing that alone would be uninteresting and frankly, a little depressing for me. If I'm separated from my crowd at WDW for some reason, I'd rather just walk around and take in the details or shop; do the "self absorbed" things that I wouldn't do with a companion.
Oh - and why is going to a restaurant not strange? We all gotta eat, and sometimes we all don't feel like cooking - or we want a certain thing that we might cannot prepare on our own. For me, its always better to have a friend along, but it's not strange to be there alone.
Just my thoughts...