Well said. Is not the purpose of our skills as programmers to make our lives easier? If so, then as long as Bootstrap is built properly then it is the kind of tool that enables us to quit wasting our time on tedium and build more interesting and more useful software.
People use these things to get shit done. I use them to get shit done and I've been doing this for 15+ years now.
"Craft wanking" might soothe your arrogance, but it won't help you ship anything.