Well, turns out that Google just would not restore stuff. Got to the step in the new phone initialization where google asks for a username/password, then puts up a list of devices to restore from, and selected my previous phone. Expected the next screen to be "what do you want to restore." Instead, the phone goes to never never land (blank screen, infinite hang). Tried a few times more (factory reset, restart from scratch, etc.)
Folks at Verizon passed me on to Samsung support who passed me on to Google. It sure would be nice if they had some diagnostics (like Verizon does when a phone won't pick up its EIN). But no... no logs, no diagnostics, no nothing.
Finally reached Samsung Level 2 tech support, who said go to the nearest Best Buy, with a "Samsung Experience" section, have the Samsung Tech reflash the PROM. Did so, but... the techs don't yet have the software!
Then went to Verizon, swapped phones - the new phone also wouldn't load.
Ultimately, I used Samsung Smart Switch to transfer everything, which actually does a better job than Google did when I got my last phone (stuff in the right place on the home screen, settings, etc.). Not complete though. Some app data had to be restored from the Verizon cloud backup, and some more (photos, calendar) came in from Google, automagically, after the apps were installed by Smart Switch. Still busily reinstalling some more obscure apps (good thing I took a screen shot of all my apps!).
Subsequently, someone on the Samsung community forums posted that they are having the exact same problem.
Very odd. Particularly that the phone is shipping like this, the lack of diagnostics & support, etc. (Note: Verizon is very good at support - including escalating to vendors - but they can't do very much when it's a vendor problem, and the vendor support sucks.)