Also running 3760x1600, although have done 4960x1600 before (2560x1600 and 2 flanking 1200x1600). About to receive a second 2560x1600, so will see how 2x 2560x1600 is in comparison.
For work, I haven't been able to go back to less than 1600 vertical pixels. As far as configurations, I do like having a single main focus, which is possible with either one or two 1200x1600 displays along with a single 2560x1600. I suppose I will find out how two 2560x1600 stacks up. Still anticipate using one as a "main" display, and fortunately I have enough desk space to arrange/add if necessary.