I haven't played in-person D&D since 2006. However, I do miss physical dice, physical character sheets, and everyone actually paying attention. There's no way to know if everyone in the voice chat is not "surfing the web", watching videos, playing a video game, or doing something else other than paying attention to the game.
I have been guilty of doing this, though only once things took a downward course. Basically only when someone new joins in, and the dynamic of the game completely changes, because almost always the new person chooses power and overshadows one or more of the original characters. This happened to me during my previous group I played in. Quickly lost interest, phoned it in while doing other stuff, before finally just dropping out.