That part was true before the lifeguard tower. We were there in September of last year and they made you put the life vest around your neck even then. The lifeguard tower was added in response to the drowning last year (IMO). I think it's a good addition because when we were there in September there were several sharks that came into SB and the lifeguard was way back over by the bar. People just stayed in the water even though the rest of us were yelling shark at them lol. I think it's needed for everyone's safety.
The only real change is that you can't set up your chairs directly in front of the lifeguard tower.
PS...which cruise are you on coming up (from your signature)? We're on the 4/29 sailing of the Dream. I assume by your name you're from Pensacola? We are too!