I think it is a good thing for locals and business owners kapag madaming tao. If you really want to relax and have a more ambient experience, punta ka talaga sa non-peak months. Kaya talagang marami kapag March to June kasi bakasyon ng students (for many colleges and unis). And, for working people, usually those months are where they could enjoy some free time with family and/or friends.
Just because madaming tao, doesn't mean hindi na maganda yung lugar. There are people who enjoy crowded places. There are those na walang pake kahit crowded kasi they just want a change of scenery, even just for a weekend.
And yes, don't expect a Boracay-ish level of beach na white sand. More on surfing talaga ang dagat. Best time to surf starts October until the rainy season kicks in.