the WoW one seems to have the usual deficiency of "worlds" in such contexts, that they are only a few days' walk across at most.
Tolkien avoids this one by not even pretending that Middle Earth is the whole world or anything near it, and it is also quite large. I've never really been clear of the timescale of Lord of the Rings, but the main action of the book ( as opposed to various events such as Bilbo's party, and Frodo's departure, which are specifically described as being several years either side, I've always had the feeling that the formation of the Fellowship, the Quest itself and the return to the Shire cover a period of about 5 or 6 months.
A lot of fantasy and SF worlds have this problem. Discworld avoids it by being world-sized, in the sense that there are parts of it ( such as the Agatean Empire, Howandaland or Muntab ) which exist as fully-fledged cultures so remote that they have little contact with the main narrative area around the Circle Sea.