I did find an excellent way to motivate myself to crochet more of them granny squares this morning: Two hours of knitting with cotton yarn barely thicker than double sewing thread, on 1,5mm thick needles, and after that crocheting went like a dream.
On the upside I found out that my gloves (yep, that thin thread is becoming gloves. Maybe. If I can ever finish them.) won't need as many stitches around as I feared, even working that small. That is the difficulty of making my own pattern though: All the experimenting takes a lot of time.