Your experience is not so much a recommendation for FP+ as it is to visit during low crowds? Weeks at the end of January and beginning of February are in the 5 less crowded weeks for the year. Kids are in school, there are no holidays, weather is variable.
I think enough people have already weighed in to dispel the myth that it's just low crowds and has nothing to do with FP+, but I'll add my experience since it keeps coming up.
We were at WDW in July and again after Christmas through New Years. We love FP+/MM+ overall, and felt that it made out trips more relaxed and enjoyable, overall. Is it perfect? No, and I've always said there are warts. However, nothing is perfect. FP- wasn't. You take the good with the bad, and judge the experience overall. For us it's a net positive. We had great trips using FP-, and our trips under FP+, while different in some ways, are also great. Yes, during the busiest times of year.
Some people might try and disparage the system overall because they don't like this, or they don't like that taken in isolation. However, not much of the world operates in such a vacuum.
Hey, who likes hot dogs? Yeah, so do I!! I bet I can list some ingredients you wouldn't eat individually though...
Ok, think hot dogs are gross? How about a big 'ole pot of meatballs and gravy.....yum. However, few people would want to munch on the raw garlic or eat a big spoonful or oregano.....
Not into Italian, well everyone likes cake, no? Well, if someone doesn't like baking soda......