We were in St Martin earlier this month. It was an excellent trip and if your time is spent on the beach during the day and in outdoor restaurants like those in the square in Orient at night your only risk will be during travel. We found Pearson T3 to be extremely well managed though we got there early and sat away from the crowds. Security was relatively light when we went through.
The only congested area in our entire trip was SXM arrivals as 3 flights arrived at the same time and we stood in line in a long narrow hallway for almost an hour waiting to go through immigration. There was minimal separation. Saint Maarten should be managing this part of a traveller's experience more effectively.