This song isnt exactly difficult but there are certain parts that i actually played without even looking at the tab just because i've heard the song so many times. I did the same with rational gaze.
I reckon both of these songs would be pretty difficult to get if you had never heard them before. Anyone else find themselves picking up odd timings a lot easier if you just go with it rather than knowing what time signature you are actually playing.
I've had a knack for picking up the stacatto/oddly syncopated stuff for quite a while, as I've played that much of it that its a natural feel to me.
I do like to know what time signature it is in though, not to learn how to play it, but to get comfortable with how that time signature feels so if I ever want that feel, I can bust it out myself in something.