I enjoy planning / doing the math on the quilt - figuring out how many of each piece I need to cut and therefore how much fabric I need.
And weirdly I've started to enjoy squaring up the blocks. My last quilt had 88 blocks and I remember sitting there looking at them and thinking how long it was going to take, but once I got going it was kind of fun. It doesn't require a great deal of attention, so I could let my mind wander or listen to a podcast, and it was very relaxing.