I detest flying when the field is crowded, it's impossible to do much other than fly around in circles. Having some people at the field is great, just not a crowd. OTOH, while I used to enjoy flying alone, now that I'm a bit older and more cautious, I do worry about what would happen if I did something stupid like sticking my hand in the prop. So, my favorite time is when there is one or just a few other people at the field.