I'd have to agree, I bought Skyrim last saturday on a whim (didn't plan to) and after playing it for 15 hours last week my anticipation for Zelda had dropped enormously and I saw Skyrim as being my GOTY, I booked off Friday for skyward sword but imagined myself leaving Zelda for the evening and spending all day in Skyrim.
However, once I opened my amazon order and opened the Zelda box, I needed to play this game, and I haven't looked back since. 18 hours in and loving the game, it is beautiful to look at and listen to considering it is on the less console, it is the most attractive game I have played all year.
I'm experiencing the same thing, although I forced myself back to Skyrim because that game is too awesome to leave on a whim. But Zelda does that 'okay I'll save and quit in ten minutes (...) shit how did it get three hours later' better than even Skyrim.