If you enjoy your Picasso, but live in a real world budget you probably aren't able to stand in front of the masters as much as you'd like.
And you're probably choosy about where your travel and museum dollars go. Along comes Google's street view museum feature. It allows you to do a virtual walk through to get a "taste" of the museums before actually committing to a full on art vacation.
Brilliant idea and definitely not as good as the real thing. But definitely enough to merit how you plan your culture fix.