Just because someone completes a lot of quilts, doesn't mean they are rushing the process. Maybe they love it so much, they just can't stop. I used to make 2-3 quilts as month. Never rushed, but I'd come home from work and quilt for 4 hours. Or quilt all day (12-14 hours) on a weekend, just because I love it so much and it's my relaxation time. Certainly gave me a rep for being Speedy Gonzales, but as I said, I never rushed a single step.
Now, I hardly get any quilts done - maybe 3-4 quilts in a year - because I've started longarming for others. That takes up all my quilting time now.