The most impresive thing about the Orsay are by far the queues at the entrance...
There is a 2 hour waiting line at the main entrance, but smart people make reservations in advance for their tickets. THen you have to wait about half an hour in line at the desk for reserved tickets and one more queue hour at the entrance for reserved tickets - the french call it something like "shortcut entrance", which is hilarious.
It also seems to rain everyday in front of the Orsay. At least everybody I know that has visited the Orsay have stated that they stayed in line for at least on hour, in the rain.
This all means that the final satisfaction of viewing Picasso, Van Gogh, The Masks and the rest will be quite high. It better be!
A final advice for any future visitors: be sure you have eaten plenty back home, but not that much that you would require a visit to the little persons room. There are reasonable sized queues both at the caffeteria and the toilets. And while the toilet is free, at the caffeteria you will pay for a soda and yoghurt more then in the Buddha Bar... Enjoy
