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Bootstrap helped popularize this pattern, and I don't think it's been good for the web. It also steals valuable screen real estate for tiny laptops, like the 11" Air.

If you use Firefox, since about version 17 or 18 it adjusts the amount that Page Down/Page Up/Space/Shift+Space scroll by if it detects a fixed header. It doesn't always work (non-full-width headers it doesn't typically catch) but it's absolutely marvellous to have.

It's the funny thing about floating navigation; usability testing and A/B testing show that it's good for conversion/engagement/whatnot, but until Firefox fixed it I absolutely hated the pattern for this very reason.

When you connect this with the usage of Zoom Text Only option in Firefox, due to zoom (bigger text) + an overflow (if divs do not fit any longer within the parent width) the top bar can take substantial part of the screen on desktop also. Quite annoying indeed.

When websites do it well I love it! They can pick the most important links for me and put them in the nav so they're always available without me having to scroll around.