Absolutely. I'm a backend/infrastructure guy and spent a lot of time creating internal tools with web interfaces over the past 3 years. Thanks to Bootstrap, they look decent, modern, took very little time and people were happy to use them. Sure, not the most original designs, but that's light years ahead of crappy interfaces I'd have produced otherwise.
Some engineers like to complain about 'yet another bootstrap template' a lot, and I can understand that it gets a bit dull and boring, but that's much better than the alternatives.
But it's got a consistent look and feel to all components, and that look is a mile above anything I could design from scratch.
So in the same way you use it to build professional looking websites with limited HTML/CSS knowledge, I use it to build sites with very limited design knowledge and no sense of aesthetics.