yes, i do quite often use latin spells, my name, Veneficium is latin for Magic. For me, i feel that by translating some spells into Latin, they work better, and are mor powerful. some people may not agree with that, its just personal feeling and preference.
Speaking a deferent language in magick is not giving more power on spells. Words don't have power. But, the feeling you gain when you are speaking a deferent language which you believe is awesome by speaking it, that is giving you a feeling of success. Everything on spells is about faith, goodwill, and self confidence. Words, are helping sometimes on the section of faith and self confidence. That's why many people are using latin language, because that feels good on them, and helps on faith and self confidence.