One thing that's difficult is choosing the finishing time on the video. For example if it's 5 seconds or something, the two end points are really close.
What do you think about beta.gifyoutube.com? It's a little different mechanics for choosing start time (which I'm not the best fan of), but maybe it's a little easier for end time.
I'm actually not really sure on this. We were going to try some A|B testing but the beta GYT isn't 100% ready
I couldn't test it because the video didn't load. I saw the beta UI once (two slice bars), but when I reloaded, the video didn't appear. (I tested IE11 and Chrome)
Another small UI complain. If I type in the text box the YouTube address and I hit the enter key, it doesn't get to the edit page. I have to reach for my mouse, and click in the green "Create Gif" button.
Nice useful tool.
you could argue that if you really cared you'd just use a GIF editor to "trim" the final result to your liking, but would be nice not to have this step.