Big blocks of description will absolutely kill your pace. I have no idea if this is the advent of TV, but I've always been like this. If you stop the story of three pages of description of something mundane, I forget where the story was, and/or my eyes glaze over. Also, more effective techniques have come up -- ones where you slide in a little description here, a little there, and your reader has built up a picture in their head almost without realising. Much more subtle. But then, not everyone likes subtle I suppose!
Anyway, you would add in a descriptor here -- the guy got into his beat up car -- and another there -- grey paint flaked off as he slammed the door shut -- and bingo, your reader knows it's an old grey car with flaking paint.
Also, two or three really telling details can tell you as much as a page of description. And lots of readers don't like to be spoon-fed. Give them the gist and they'll fill in the rest, provided you've given them the right details. Description is all tell - show me your world (in action, as your protag moves through it) don't tell me what it's like.
That said, nothing should be slavishly adhered to, If your style, or this part of the story needs a description, then give it. But make it interesting -- don't give me a laundry list of 'It was a house, made of red bricks, with a grey slate roof'. Give me the unusual things, or from a POV I've not thought of before, or a way of looking at a house I've never seen (The house hulked like a giant abandoned baby, waiting for someone to come and play). Make your description, when you use it, come alive.
ETA: A really good way of practising description (esp of people) is go to a cafe. Sit down and describe each person, but you are only allowed to use three details to do it. See how you can conjure an image of that person in those three details -- give the essence of them if you will, not a police style run down of physical attributes. His messy hair, her jumper with the bobbles on it, that guy's way of pinching his nose etc. Works for other description too.