Welcome to PPrune,
BACF flights have used both SAT1 and SAT2 in the summer season. Yes EZY and RYR are the main operators from SAT2 with all the domestic flights and operators using it to. LS haven’t used SAT2 in this summer season.
Their are plans to full update SAT2 and 3 in the ‘Stansted Transformation Project’ but because of local government issues some plans have been put on hold for now. Hopefully when this is resolved plans will start to role again and construction works will begin.