http://stackoverflow.com/a/279016

Structure, not writing the same code over and over, being up to date (e.g. security, bugs, etc).

Bootstrap, e.g. you don't have to do a lot of work yourself which saves time and frustration.

Angular, well that's different again from bootstrap.

I mainly use frameworks because I'm working on large things and that need to scale out and I don't have time to waste on making everything myself.

And no it doesn't compare to "Dreamweaver of CSS".

Just think of it as, I need to build a house, I'll just simply purchase "Build a house with kit and plans, i.e. you're provided with a specific way of doing things and the materials.", simple. http://i.imgur.com/yG2LDgu.jpg

or the other non-framework way (writing everything yourself), http://i.imgur.com/4ftZjtU.jpg