I've been to Paris many times and I speak French. Having said that, I think Paris is frought with problems for many visitors. Especially the idea of waiting on long lines, trudging from one monument to the next, or to see something that you are 'supposed' to see that maybe you are not really interested in.
Of course, any Disney vet should be familiar with long lines, but maybe save those for DP itself.
If you really need to visit something, then figure out how to not wait in line, just like you would at Disney. Or if something is not a priority, you should then skip it.
My favorite thing to do in Paris is to take the stairs to the rooftop of the Basilque du Sacre Coeur in Montmartre. There is a small admission fee, and it is a lot of stairs. Here you will have the best view of Paris, plus you get to see up close the amazing architecture of the Basilica. You will have the Eiffel Tower in the view. In going up the Eiffel Tower, you don't have the Tower itself in the view. Personally, I am completely underwhelemd by going up the Eiffel Tower. But if you feel like you must, then reserve your lift tickets way in advance. Montmarte is a sublime, atmospheric neighborhood in Paris, actually on a mountain. There will be more tourists per inch here than anywhere, but the architecture is so gorgeous. Do not eat in any of the cafes, though.. The food can be horrible and a really bad ripoff.
My next favorite thing to do is on the weekend, which is to visit Les Pouce de St Ouen, a historic and dazzling antiques flea market. It is actually a dozen markets put together. The oldest market, Marche Vernaison, was featured in the movie Midninght in Paris. It is very old.
Go see the Dome inside the Galleries Lafayette, a department store. It is spectacular.
Walking around the historic tiny streets of the Marais neighborhood, the beginnings of Paris, is also very special. Some of the shops, like Mariage Freres (a tea shop) on rue Bourg-Tibourg are so old that it is like entering a time machine. Walk through the beautiful Place Des Vosges. Get a good walking tour map of the Marais.
Strolling the Champs Elysees is a waste of time, just like being in any big city.
Get out of the lines and stop and smell the flowers.