And in a good way.
Shorter attack and release times (smaller numbers) will make vocals sound more “energetic,” louder, and will also bring out the breaths between words.
Longer attack and release times (higher numbers) will make vocals “punchier” which obviously isn’t as important for vocals as it is for other instruments like kick and snare.
Don’t be put off by the title. It’s a great comprehensive overview of compression – and not just for vocals.