For me, its platform dependent if Im on windows or Linux I prefer Firefox, if Im on the Mac or an iPhone I prefer Safari, if Im on android I will usually use chrome or download the android Firefox build. While other browsers have their strengths and weaknesses, those are my top choices based on platform to get me through 99% of my work. While working on certain internal systems, I still have to use Internet explorer which is really sucky.
So at the end of the day, modern web browsers are definitely nice to have but the older stuff has a place too.