I crossed the Drake a couple of times (2014/2015 on Seabourn Quest, and 2024/2025 on Seabourn Pursuit), and the crossings were not bad at all. In fact, our captains told us that on average, only about 1 in 7 crossings experiences rough seas. Also, most ships have capable stabilizers.
I will visit Antarctica (and especially South Georgia) again in the future but would never choose the fly option. After all, it's a rite of passage to sail the Drake!