I agree that some addons are vital for the game and the learning experience. DPS logs are the only way to properly gauge your performance and oQueue was immensely useful during it's time.
But when it comes to DBM, I think it makes the game less fun and in some cases, less challenging.
I prefer visual queue's than a timer bar personally but some mechanics are way easier to handle with DMB timers so it's hard to pass up.
Beyond dps logs and UI customization, most addons really should go.