After thrity years at it, reading (in proper notation) is a terrific thing, but: It's like learning a foreign language inasmuch if you don't speak it all the time, your skills erode, more for some than others. At one time I read both clefs effortlessly, BUT I was playing/practicing classical music at the piano every day. Now, it's a chore to read quarter notes in my F-clef scale books!
For me, tab is useless. Living where I do, the Number system has been very useful, but it's no replacement for standard notation IF you need to read written lines. For the usual gigs i do, I've never seen any charts in regular notation.
It's the real langauage of music, but you have to decide for yourself if you really need it.
J o e y