I never leave my house without my Frostspark boots. There are too many cons to most mounts.
I'd even say the horseshoe balloons remain useful in certain situations. I love to use mine during the Duke Fishron fight, because you take off faster with them.
Anyway, there are many accessories that are basically useless to some, and useful to others. Everyone has a different play style. If an accessory doesn't work out for you, find another!