The retiree health care thing is pervasive at my Megacorp. Very few people know it exists. It is full pay, no discount, but the network is excellent compared to similar ACA plans. Well worth it if you don't need the subsidy. I'm not sure why Megacorp doesn't talk about it. They used to list it in the benefits booklet, now it is buried on some web page somewhere. I guess not too many people retire, they leave first.
The other thing to mention is possible access to 401k at 55. Not all plans allow it, but those that do it can really be a huge help.