My experience is somewhat different; I don't recall playing in a game where a cleric has actually ever cast Bless, but then the players I mostly play/run for generally aren't the type that look for the most statistical benefit.
It definitely is a powerful spell, esp. if combined with Sharpshooter/Great Weapon Master.
But, it's not one that will rub the rest of the party up the wrong way, because it empowers the party, rather than let one player show off.
And it's obviously not *required* in any way by the standard maths of the game, newbie groups don't TPK regularly because they don't realise they "should" be casting Bless.
Like alot of optimizing in 5E D&D, it will let you punch above your weight, but you're probably doing that already, the Encounter guidelines (and similar) are aimed at casual players.