PT and PAHud are great tools, and you should definitely get them. First, by itself, PT will help you evaluate your own game and possibly find some of your largest leaks. Coupled with PAHud, it is much easier to keep track of players in game and know who is decent and who sucks.

I personally play 5-6 tables of SH and so making a lot of individual reads is tough. When I notice someone doing something particularly strange/stupid/good, I make a note of it. But otherwise, I look at the stats and use them to help me determine what to do. A lot of the time I will 3-bet marginal hands preflop because I notice that the previous raiser has a PFR of 30%. Playing 5-6 tables of SH, it would be nearly impossible to remember who is raising how often without the hud. It won't answer specific questions like the example you gave but it still provides great information. Multitablers can't go without it.