I think it depends on how you approach vibe coding.

If you want to actually understand the code that goes into production or the engineering behind it, then yes, cost for context switching has increased massively.

If instead you just hand off engineering and understanding to the machine entirely, and reduce yourself to copy&pasting github issues into Claude Code and clicking the green button on its PRs, then there is pretty much no cost to context switching (because your brain is devoid of context).