ClickUp was the first software whose AI integration was actually useful to me, but simple because its UX is so mind-bogglingly terrible that I'd rather give an LLM a minute to give me the information I'm looking for.
But really I live on bookmarks to get to the handful of places I want to go because I hate navigating their UI and the MCP so I can just have Claude move around tickets, log new ones, update statuses, etc.