While I agree that language courses in general are better in the long run, for art history you should follow them up with a reading heavy course. I took regular German classes for a year and then did an intense Maymester course (3 weeks, 5 days a week, 3 hours a day- yikes) focused just on reading in German, but came out much better for it. You'll also notice that if you really need a language-particularly for reading you'll pick it up quickly after getting only the basics. I only took one semester of French in undergrad and now as a Gothic architecture person, I read more in French than English and it's fine with practice. The beginning of any language is tough, but it gets easier.