Yes basil is bush like. I keep mine in a pot in the kitchen but it's a big pot lol. Cilantro gets a couple of feet tall so it helps to give it some space. The cilantro is all at the bottom of the
plant so if you aren't going to harvest the coriander
seeds at the top you could probably keep it short so it was easier to deal with in the house.
My parsley is also in a clump but I don't know if that's a good idea or not. I never thought about asking the question. So thankyou for posting that one.
I still haven't had any luck
growing oregano so I don't have your answer to that question either.