I've tried I don't know how many times to get into WoT, at least twice a year for the past five years, but I just can't do it. I have limited patience for descriptive passages and world building. Tell me if it's wet, dry, overcast or sunny, give me a rough idea of the terrain (trees, fields or desert? Hilly of flat?); by all means drop a hint or two about how the world works, then for goodness' sake get on with the story!. They just don't have any rhythm or melody in the narrative, all variations but no theme, if you follow my rather odd analogy.
GoT on the other hand, keeps description to blessed minimum (it's either snowing, temperate or hot. The terrain is either white, green or brown accordingly. Bam... next!), letting the reader's mind fill in the details. The world building information is spread out over pretty much the whole novel, rather than layered on with a trowel at every opportunity. More importantly, the rhythm of the narrative is right. It's percussive, driving, portentous. There are variations aplenty, but the theme of pervading menace never relents throughout the entire, not exactly anaemically thin, novel.
In short, for me GoT feels as long as it needs to be*; WoT feels stretched to breaking point before I'm a quarter way through the first volume.
* I'm speaking only for GoT here, as the question asked. I'm not going to go barrelling through the sequel volumes until I know the series is completed. Once it is, watch me streak through them.