Everyone here seems to be picking it up - including a dear friend who's pregnant

We haven't had an inoculation in a while, masks went from a must to optional to never used any more and as for social distancing, well, it isn't anymore.
Have we let our guard down?
My wife, special needs son and myself (our household at the time - we now have my terminally ill 88-year-old MIL living with us) had it once in July of ‘22.
My wife had it the worst, our son to a lesser degree and it was just like a slightly annoying cold to me.
At the time, we had all had both initial Moderna doses and at least one booster.
None of us has had a booster in well over a year.
We were just in WDW from June 26th-July 2nd.
The morning of June 30th, my wife had what initially seemed like just some allergy sniffles. Our son started having issues towards mid-day and I had no issues at all.
Our oldest DD, SonIL, 2 young granddaughters and youngest DD were staying in an adjacent room at OKW. Oldest DD had a box with 2 tests in it that she put by our front door that night. It had only 2 tests in it.
Both DWifey and DS tested positive. Even though I had no symptoms, we just assumed I was gonna’ be positive, as well.
DWifey and DS’s Covid symptoms were nowhere near as bad as last time, and I never had any symptoms.
But, we missed our last Park day at DHS with the rest of our family, and that sucked. We love them all dearly, and my DWifey was, initially, in tears.
Anyhoo…
After we got home we all tested again (me for the first time), and DWifey and DS were still positive, and I was negative. I never tested positive.
Also, we haven’t worn masks for quite some time, although we did wear them on the flight home, and around my MIL once we got home, but she never exhibited any symptoms or tested positive.
At this point (and I’m no doctor or virologist), I’m of the mindset that the vast majority of all those who would be severely affected by this already have been, and for most of the rest it’ll just be an occasional annoyance.
I don’t mean that to sound hard-hearted, although it probably does, but it’s just my thoughts regarding such, at this point in time.