I cook mine the same as some others, but instead of using the Lipton mix, I buy beef soup base (chicken soup base for chicken too) and use that. I also cut a pretty big onion up (in the food processor because I don't like onion lol) and just toss it all in a pan for 3 hours or so on low and covered.
If I'm making mashed potatoes (rare around here) I add nothing else to my pot. If I don't want gravy though, I toss lots of carrots and potatoes in the pot about an hour before it's finished. The carrots will make your broth very strong, so if you want gravy, I wouldn't put them in. The carrots and potatoes are awesome when cooked in that broth though. If you want just a little gravy for the meat (hubby likes it, but kids and I can pass, you could take some of the broth out before adding the veggies.
My BIL had a fight with his live in GF a few weeks ago and stayed with us for a couple of nights and he cooked a roast while he was here. He did it in roughly an hour inside his pressure cooker. I'm being 100% honest here. It was the most tender roast I'd ever had and I've made some super tender roasts in my day. I didn't think it had quite the flavor that my roasts do though, but I'm wondering if we'd have added more soup base to it if it would have had a better flavor. I'm not sure if he put onion in that either, but I bet that woulda helped too.
Needless to say, hubby wants a pressure cooker now. I have one of those HUGE, what, 6 or 8 quart pressure canners and hubby thinks I should be able to use that.
Edit: I just wanted to add that it's the one and only time I think those nasty type carrots are better than the bagged baby type. I don't know why, but they just turn out so much better tasting in a roast.