Maybe it's also due to differences in personality. I like to focus on one or two things at a time. And on second though, my argument about wasting space probably doesn't make sense. Perhaps I'm thinking more about "information overload".

In my day to day I have a couple terminals (each with 4-5 tabs, some are running screen sessions), two browsers (with max 3-4 tabs open), music player, at least 2-3 IDE's open (JetBrains), Notes, mail client, Slack. This is across two monitors.