I have solo alts and mains, I have every profession except Tailoring to 375, so not really looking for anything from professions. And it definitely slows leveling, by a ton. The only exception is skinning, which I have on one toon, I started with herb and mining too, but at around 60 skill points, I left those early zones and never looked back. You have to work at leveling those two, and it never levels fast enough. I haven't really decided what I'm going to do with my team at 70, if they just pvp or run dailies, I'll probably just level whatever profession benefits them most, alch/JC/LW whatever. It makes no real difference to me actually.