Went to my local Best Buy store, and to the Samsung area. Started talking to the guy there about the S8+, and he pulled one out of a drawer, where it had been charging. So, I really got to play with it. First things first, I popped it into my left front pants pocket and sat down in a chair nearby -- I was able to sit down without any problem. So, I could probably live with it in that regard. We also looked at a bunch of other things, which generally met my satisfaction.
Then we started talking about promotions, and he showed me one that seemed to be "Get the VR thing, then you can get a set of Bluetooth earbuds and a 256GB MicroSD card for $99." Hmmmm. He grabbed one of the Best Buy higher-ups, and they talked about engineering everything -- the promotions expire April 20, whereas the phone is supposed to be available on April 21. So, this is all in "pre-order" territory. We talked about buying the S8+ outright, which I was expecting to do since I definitely haven't paid off my S7 Edge on AT&T's Next plan yet -- but that wouldn't trigger any of the promotions -- you've got to sign up for service to get them. So, it was "pay off the S7 Edge, then plug the S8+ into my AT&T plan. They talked about trading my S7 Edge in, which I figured was some kind of ridiculous thing like "for a $50 gift card," but they were talking about something like $300 - $350 for my S7 Edge. So, I might think about that, though I always just hang onto my phones as "backups" if I ever have any problems with my new phone.
Bottom line, looks like I'll go in next week when things are quiet, and sit down with them to come up with a plan to move forward.
Oh, and one other thing: The S8 phones on display tend to use a smaller zoom and a smaller font than I've been using on my S7 Edge -- frankly, I don't think I've ever messed with them. I mentioned this kind of thing up above -- comprehend how you can set your S7 Edge up very similarly to the smaller text and such that they tend to have the S8 phones on display set up with. You might make some changes to your S7 Edge that might help you avoid some S8 lust.