I, as Adobe Premiere Pro user, don´t use default transitions. I only did back at my begins with Ulead 6 and 5. I preffer to do the custom stuff. Yeah ok... there was one time were I used a transition because I was too lazy for the motion stuff
Different kinds of blur fades, fadeouts, coulour fades and crossfades are in the highest amount of different transitions in one of my amvs.