I know of pilots who ask to go before the 2 minutes (3 if it's an intersection), and their reasoning is that they can take into account the current met whereas the controller can't. One would say things like "because of the strong winds it will dissipate much quicker". There is probably some truth to it but I don't know enough about the science to do it myself. I prefer to default to safe and go with the 2 mins (or 3), using my own stopwatch.
I wonder what their insurers would say if they needed some work done due to encountering wake turbulence and not waiting the 2/3 minutes???!!!