Thankfully, a nearly one month hiatus from swimming didn't entirely destroy my fitness. I dragged myself kicking and screaming to the pool this morning for a relatively easy 1600 with zero expectations. The last swim I did was atrocious and my motivation was shot so the time off was mostly mental, but as it turns out, it was also good for me physically. It came back immediately and my form didn't deteriorate until the end. I was definitely a little slower but I don't mind. I have time.
So maybe swimming is like riding a bike - once you know how to do it, you can take breaks from time to time and jump right back in without missing a beat. Let's hope.