I think a lot of it depends on where you ski, too. If you're skiing the kind of abrasive man-made we get in the east, you have to wax a lot more often than you do if you're skiing nature-made snow all the time.
I've arrived at my current methods by experimentation and seeing what it takes to keep my bases from getting grey and fuzzy.
For me:
1) Post-grind, put a thick coat on, do the reheat/let cool cycle 4-5 times (adding more wax if it gets thin). I found that 3 wasn't enough and 10 didn't work any better than 5, for my usage.
2) Apply a wax of the day Friday night for whatever the weekend's temp range is. For me, that's almost always a broad range mid-temp wax, but when I'm going to Maine for the weekend it'll often be a cold wax. In the spring, it might be a warm wax.
3) Scrape and brush the crap out of it. I typically just use a natural brush that's medium stiffness, with some help from a copper brush for cold waxes. I don't go crazy with tiered brushes of different softness, but I find it really noticeable if I don't free the structure.
I've recently been screwing around with fluoros for wet/humid days, but haven't found a method/wax that lasts as long as I want yet.
With this strategy, I'm able to ski for 2 or 3 days in a row without my bases getting grey and fuzzy, which is mostly all I care about. If I'm skiing someplace that has less abrasive snow (eg, the west), I can go a week without waxing (or sharpening), and my skis look the same at the end as they did at the beginning. It's pretty neat!