Glad you made the right decision. That was an awfully short window!!
FWIW, my last day was yesterday and I officially joined the FIRE ranks (assuming 61&4mo is early) after taking advantage of basically the same package, except my pay will go on for 14 months, with only 6 months paid medical, but they provide excellent subsidized retirees medical for only $265/mo till I turn 65, 3 years later. While I only have about half of your portfolio size, the real kicker was the package started my pension (about $55k) at the same time, so a hefty “double dip” for a year. It did take me about 12 minutes to decide, but it really came out of nowhere so there was some scrambling to do. I had planned on 5/2020 as my date, so it really was a no brainer.
Congrats, and I hope you get it.