Cobs are a great "learning" pipe. In order to get the best smoke out of it, you have to smoke it real slow. They do tend to get hot if your not careful. If you have a problem with puffing to fast and hard on a briar, then go to a cob, if for nothing more than the practice. However, don't be surprised that while you are working on a slower method of smoking, you discover that maybe you do like the pipe after all.
Is a cob my go to pipe? Sometimes. If I am sitting out in the yard enjoying the day, I'll grab a cob. Same if I am fishing, mowing the lawn etc. For being made out of a cob, they are very durable, (and even if something happens to it, they are fairly inexpensive and easily replaced. (and a plus, if you drop it in the lake while fishing, the thing floats) If I am in the house, I will usually go with a briar.
After the first few smokes, the corn taste pretty much is gone and you can get the true taste of the tobacco. Never had a problem with ghosting, but then again I have a number of cobs. Some are used for VA's others Aros and so on.
I can sympathize with the taste changing on the tobacco, I had it happen myself. Not just with a cob though. In my case it usually tends to happen with the same pipe. I can smoke a blend during a warm summer day and then smoke the same blend out of the same pipe during the late fall and the taste is completely different. (Go figure)
I don't think that it's "kool-aid" if you get a cob, at least not any more than it would be if you got a Peterson, Dunhill, Ador or so on. It's just a pipe. And it isn't for everyone, but that doesn't make it good or bad. Choice is the one really great thing about this hobby. You don't have to like everything and yet there is still plenty enough to keep it worthwhile.