desdinova - Let me put it this way, I've been playing around with growing since 1969. In all that time I've never had an EC meter or tried to figure out how else to measure it. In fact, its only the past 12 years or so that I've used a TDS meter to check PPM. So I guess the answer is NO, I don't check it and don't sweat it. It's not a bad thing to do and I know it can really help in controlling things, I've just never had the need or desire and I like to keep things as simple as possible.
Everyone and every plant likes a cool spring shower on a hot dry day (myself included). Yeas ago I used to mist them with a very very mild solution of cheap-o Miracle Grow, and it did help them beef up. Then somewhere along the line I decided I didn't want anything applied directly to the leaves and buds I would be consuming, so I switched to using plain seltzer in my mister. It has a high concentration of carbon-dioxide which can only help, and now I can and do often turn the mister on myself as well.
One last note....if you decide to mist, stop doing so once the buds start to become tight and dense. Otherwise you stand the chance of creating conditions perfect for bud-rot and mold.