As a 'thank you' to those who posted their experiences and making my journey easier, an update...

- Flying back from TRV to JFK via DOH, they asked about electronics and I said 'none to report'. At DOH, they packaged up my tablet at the departure gate itself.

- No issue with my older Bose Noise cancelling headset - QC 3 I believe.

- At JFK, ended up waiting about 10 minutes for my luggage and then 5 minutes after that the boxed laptop arrived at the oversized luggage area. (I have Global Entry, so was through customs/immigration in minutes.)

Side notes:

- Flight out (ATL - DOH) was packed in Y.
- Flight back (DOH - JFK) had perhaps 50 or so seats free, many were able to spread out.

- Had to go back out and re-clear regular security to catch my onward flight at JFK, which was a bit of a pain. I would have missed the connection (due to QR 701 being late) if I didn't have Global Entry.

- On the DOH-JFK route, I gave up my bulkhead seat for a young couple that needed the space, and joked with the flight attendant that the only special meal I ordered was from first class. At the end of the flight, he went around asking all the flight attendants where I was, and found me and gave me some arabic sweets. Very thoughtful, and I'll write a note to QR.