Here in se MN, the DNR actually started some habitat work where they clearcut red cedars growing on south-facing slopes. They did the clear-cutting in winter, then burned the cuts in spring. After the burn, they'd seed native grasses into the openings. This was to re-create grassy openings (called "goat prairies")that were once maintained by naturally-occuring fires.
One goal of the project was to see if local populations of timber rattlers would respond to the improved habitat of the goat prairies. They even captured four rattlers and implanted GPS tracking devices in them.
Anyway, the DNR would even pay area landowners to do the cutting for them. My dad participated, as his small property had some decent cedar stands. Some people went whole-hog, others did small patches and left other cedars alone.
My overall impression agrees with Sligh's comments. I think leaving some cedars for bedding/thermal cover is a good idea. But big patches of red cedar isn't that great for deer, IMO. They grow very dense over time and deer can't even travel through them. The "edge" created by cutting some is attractive to deer, and they seem to like picking for forbs in the openings. Maybe a guy could get creative and clear-cut them in areas that would be advantageous for travel, bedding etc.?
Oh...as for the DNR's "rattlesnake study"...we found out that 3 of the 4 snakes study snakes wound up in tree tops. Turned out hawks and other raptors had better snake-huntin' near those goat prairies!