The TG BKK F lounge isn't that impressive as a lounge per se, but the entire process is probably as good as you can get. Firstly, you get a separate F check in, a personal assistant to help you through the exclusive customs and security checkpoint adjacent to the check-in area, then you get a buggy ride to the F Lounge. As a F pax and depending how long you have, you can immediately ask to book in for a 1.5hr massage full body thai oil massage or a quick 30 minute head,shoulder and feet massage if you are short on time. The Royal Orchard Spa is opposite the F Lounge so its a dedicated spa area. Yes I opted for the 1.5hr oil massage and it was divine just before a flight.
The F Lounge you'll likely get a semi-private room where it opens to the main areas, the alcohol choices were Ok, the food choices were a-la carte as well (which will be delivered to your room, unless you want to dine in the restaurant).
No announcements are made in the lounge for boarding, however your assistant will come and find you when your plane is ready for boarding. You may or may not get a buggy to the boarding gate, so expect to walk the final few hundred metres to your plane.
Regardless, do enjoy! I'm envious!