I believe every companion has at least a couple of locations that can trigger conversation, and at least one gift that does the same, but it was disappointing that you can't talk to them like you could in Origins.
My biggest problem with the expansion is that it was really easy. With the increased level cap, and some of the high-end abilities, nothing but the end boss was any sort of challenge, and even it was easier than the archdemon fight. I guess that makes sense, within the game's lore, but it makes for any anti-climatic game.