Thank you all for the overwhelming amount of responses!
Maybe I should preface my situation a bit: I call myself a "professional" because I once read if I want to actually be a professional I should act like one. I know there is a massive difference between the seasoned professional who takes photos in his sleep and me, someone who has one or two sessions every other weekend and only six weddings planned for next year so far (which I think is great for having started this business in June). Simply because I'm not shooting seven days a week though, doesn't mean I can't be providing a professional service where I strive to give my clients the best product that I can and learn as much as I can to better myself.
Also, when I typed "convinced" I really meant "I've already decided to take the plunge but would still appreciate personal experience."
I greatly appreciate the advice about using LR with RAW. I tend to push exposure a lot for my own style and to accommodate changing light situations as much of what I do is outdoors. In that sense, I'm sure I'll notice the benefits immediately. I'm sure I'll also notice that I'll be needing a new HDD pretty soon, but that's a minimal cost compared to a new camera which I'm already saving for.
I shot an engagement session this morning entirely in RAW. Perhaps this will convert me for life.
Great! I just started shooting RAW after I got the 5D3. Till then It was all JPG. Once I tasted blood - er - the power of editing RAW, I have stopped shooting JPG. Yes, it is a bit more work but I think it is worth it. I shoot a lot of impromptu shots and so nailing everything is not always possible. With the 5D3 I have shot a lot of shots with ISO >= 6400. These would be very difficult to edit as JPG...