I have a vivid memory of once looking over someone's shoulder in the IE days and being horrified to see toolbars taking up about 80% of the available screen real estate, leaving only maybe 150-200 pixels of vertical space for actual web browsing. I have no idea how they got anything done, and my guess was they never actually used any of the installed toolbars and just thought that was normal.
You can see this today on macOS. I see people with this at work all the time. The defaults have quite inflated scaling and the dock at the bottom. The vertical space left for a website after the address bar is hardly anything.
I have this memory too lol. I was really quite young but it's like a core memory. Similar to when a middle school teacher told me about Firefox and I discovered tabs.