I guess it all depends on the usage you make of the command line. I work with a lot of data in directories that do not have nice names (spaces, long sequences o

I guess it all depends on the usage you make of the command line. I work with a lot of data in directories that do not have nice names (spaces, long sequences of numbers...), so autojump is very useful for me. In any case I'd recommend to try it for a bit, I've seen quite a lot of people changing their minds after using it for a couple days. Sure, you can emulate the functionality with aliases and so on, but this is fully automatic, and after a few days, you might very well be thinking, "why didn't I use this all along?" :)