When I was young, for several years EPCOT was the park for me. The One. So grand, so beautiful, so exciting. However, at some point I realised that in the end, it was and always will the Magic Kingdom which is the most magical.
This was before the destruction of Future World. This demise made my choice of MK for top spot more pronounced. I wish it wasn't the case, and I don't want to dwell forever in a half-forgotten past, but there is a certain sadness over me when I walk Future World. It is only in World Showcase that I can fully enjoy EPCOT, the park of my dreams, of my imagination, of cherished childhood memories.
I, too, could conceive of going to Disney for a short break without going to EPCOT. But not without going to the MK. It would feel incmplete, as if I hadn't been to Disney at all.