The answer is very specific to not only your particular industry but also the company/organization that you work for and your role there.
I joke that, with "only" a B.S., I am the slacker of my family in which my parents, all aunts and uncles, and all cousins have gone on to at least a masters degree. But we are all in different industries with different roles. Some fields absolutely require the advanced degree. Others have separate payscales dependent upon education level. In those cases, it's absolutely worthwhile -- especially if your employer pays for your tuition.
I am an engineer. My university offered a 5-year B.S. Eng / MBA program, and I inquired about it to my academic advisor. Interestingly, he actively discouraged me from enrolling in the program, saying that if an MBA would be beneficial once I'm in the industry, then my employer will pay for it -- no need for the extra year. Sure enough, my employer (like most in the engineering industry) has a very generous education program that would pay for advanced degrees related to my job. I considered pursuing an MBA or an engineering masters program shortly after I took the job, mostly due to family pressure. I couldn't find any concrete examples of the benefits of a masters degree for my career path. To this day, I have not pursued any additional degrees, and my career has not suffered as a result -- in fact, I'm doing quite well and am happy with the opportunities I've had.
Ultimately, it's a question of cost/benefit analysis. If your employer pays for your tuition, then that's a big advantage in the "plus" column. As for the benefit side of the equation, you'll want to find specific examples -- not just nebulous "opening doors" but rather specific career paths that require the degree as a prerequisite or different degree-dependent payscales.