It's pretty common. Most pasta cooking directions say to use 4-6 quarts of water for a standard 1-lb pack of dry pasta. Many Italian grandmas (I'm making a guess off n=1 person with Italian heritage who learned it this way) do it like this. Because this technique is so ingrained, it's less obvious to reduce the amount of water.
Does any functioning adult actually cook pasta in such a way as to use way more water than necessary?