We have stayed at WL several times during the winter. The park hours are short at that time. Sometimes during the evening, I go from WL to the GF, just to walk around the Poly and GF area. Unless things have changed, you can take a bus to TTC and then monorail to the GF and return monorail to TTC and bus to WL. I'm not sure how late the buses run, but I'm sure you can find out while there. The WL and Campgrounds are the only two resorts that have stops at TTC. Avoid DTD if possible, this trip would take forever. I believe the WL to TTC buses run until 10:00 pm, but I'm not real of that.
Since I really like the boats, I would do that, if they are running. Maybe you could take the boats to GF and go back to WL through the TTC.