Did I enjoy my YouTube experience?
Actually, while I think the whole thing is quite neat, I found it a little frustrating. I guess I am not a naturally patient person so I found the streaming frustrating as the clips would start and then stop - and therefore not hold my attention long enough for me to decide if they were useful. I admit I probably did way too much clicking while I should have been waiting. I also had a lot of problems with clips that had very low volume. (This complaint is not just my complaint but was cited in many of the comments posted about the clips I was looking at.)

Why do I think streaming has become so popular?
I think this is in part because the search feature is easy to use and similar clips are only a click away. These features make it a 'quick' resource (provided you are patient enough to wait for your chosen clip to load before you start checking the other options).

Will I continue to use YouTube?
I do - now - see this as something I will probably use. But, I will definitely plan to use it when I feel I have a large window of time to spare.