I only use Bootstrap GRID to make layouts, not code with Boostrap. In fact I'm webdesigner, not developer, so I just make layouts and others code it (still can't figure out how to call myself, since it seems everybody tend to merge designer and developer together - you say you are webdesigner and they want you to go code in javascript). Question if Bootstrap is garbage, well, few people still using it so I would say it's about personal preferences - like all frameworks.
And why I'm usign "outdated" photoshop? Well, because most clients want .psd format file. Beside that, what would you suggest to use, I tried few WYSIWYG SWs like Macaw and I must say that workflow is quite awfull, you need to focus on both design and code in the same time and thats often really hard and tiresome (both brain hemispheres).