Think very hard before you decide to go for any graduate degree whether Masters or even PhD. Not because Masters is bad or good. It is because there is a huge opportunity cost for those 2 years (or less).

"how much of a difference an MS actually makes in the working world."

I would say not much and I am sure there is an argument for it. Here is why. If you get a job right after your bachelors degree and work for 2 years gaining "real world" experience, you could actually be a lot more valuable to an employer or in the industry IF the employer is looking for someone with your skills/experience.

Besides, there is always time to think about a graduate degree. What if you do your MS right after bachelors and realize 5 years later that you actually would have been better off with an MBA or may be no masters at all ? You will never know that until and unless you have real world experience, trust me.

My advice: Get a job, get experience in your industry and 2-3 years later, decide if MS is still the right choice for you. Believe me, you will know then. You won't know now.