Does it hurt to have extra semi-colons? Maybe you have some empty statements. Does it hurt to have too few? Well, if you either do not know what you're doing, or someone maintaining doesn't understand what you did, etc., then yes.
Extra semicolons can cause problems. If "someone who doesn't know what they're doing" starts putting semicolons after randomly chosen tokens, it will absolutely break your program. You need to understand statement boundaries whether or not you explicitly mark them with semicolons.
