As Sue said, you are fortunate with how GA has there Advantage Plan set up.
Most typical Medicare Advantage plans only cover a person for emergency care, ER, while traveling anywhere in the U.S and will not/may not cover for routine health care visits beyond your plan's service area... and then.... outside the U.S. the Medicare/Medicare Advantage coverage is limited.
Another good advantage for you: "no referral needed for specialist, unusual with an Advantage Plan."
Interesting how insurance can be so different, be it private or government.
There you have it...proactive.. as you said and planned: " I chose jobs according to the medical benefits and retirement, not the salary." That is so true what one should, or might have to, consider when seeking employment or changing to another employer. A young man friend of mine learned that lesson the hard way. I had to explain to him what he did after having an unexpected injury with his decision of doing the opposite of what you did.
I guess the Tobi medication gets you out of what is called the "donut hole" with drug costs.
Wishing you the success you are working on with the Tobi medication.
Barbara