For my work - mostly yes. If it's not needed, it's not there.
> Then IDEs for example have a lot of menus, panes, buttons and everything.
I've got them all closed. Whatever panes are needed, they're only open then.
I have disabled most gestures, animations, and multiple desktops (spaces?) in macos. The swiping between each of these full screen apps is painfully slow to me. It's compounded by needing to pass through an app to get to one on the other side, meaning it could be 2 or 3 swipes before the app I need is the one on screen. When I see someone swipe the wrong direction and quickly swipe back it makes me cringe.
When I want an app on screen I don't want to perform mental calculation for how many steps away, nor do I ever want to have to pass through an app to get there.
If you are using a small laptop your argument holds.
However, the larger your monitor the more the benefits of having things side by site. I do it all the time. A document I am writing an email about and the email open side by site. Editor, terminal and VCS GUI open at the same time. Documentation and code open side by side. Template and web browser. Accounting software and bank statement. File manage and absolutely anything. Chat window and whatever you are discussing.
I find it easier and more productive most of the time.
The usual setup = terminal is the central half with nvim being one half of that, sometimes also split into two side by sides, sometimes not; two terminal tabs in the right pane (zellij). Browser = left quarter. Right quarter is whatever, slack, gmeet etc.
On a larger screen: Opening a terminal alongside the editor or a browser. Or opening two browser windows when working on two documents.
You sound like you're asking me why my favourite colour is red, because it's perfectly fine to have blue as a favourite colour. Of course it is fine, I just like red better.