Fluffball: good advice, but I find that annoying.
I do it on necro because I swap from minion builds in PvE persistant areas to wells everywhere else... but I would find it annoying if I had to do that with every profession. Also, finding a trait point distribution that allows for that is not that easy.
Again, thanks for the good advice. But as much as I can, I will pick traits that don't require switching instead...