It depends on when you go. Weekends are always busier than week days. You would do better to take a sick day on a friday and go then and stay over to the saturday. Do Disneyland Parc the first day and the Studios the morning of the second day, returning for lunch and the rest of the day at Disneyland Parc.
For comparison purposes - Disneyland Paris is about 2/3 the size of the Magic Kingdom, with more attractions squeezed into that space - the E ticket rides at Disneyland Paris include rides found in the other parks at WDW - Star Tours, Honey I shrunk the audience...
The Studios are a disaster. While they are frantically working to add more attractions, it does not currently have more there than a 1/2 day of attractions. Maybe 4 hours at most, and that would include all the major rides as well as one or two of the shows (cinemagique is stunning). Tower of Terror is not slated to open until the end of the year, and their new indoor roller coaster (think Premievel Whirl indoors, themed to Nemo) won't open til even later.
They have a parkhopper (it's called a Passe Partout). That will allow you to go back and forth between the two parks.
By the way - it hasn't been alled EuroDisney for three years. The name is Disneyland Resort Paris. While EuroDisney is still the name of the corporate entity that owns the resort, you won't find anyone in Paris calling it Eurodisney at all...in fact, europeans have gone out of their way to distance themselves from using "euro" as a stem for anything anymore.
I go to Paris a few times a year, and always take a day at the parks. I can do everything I want to do with my friend in one day. That omits some of the attractions you might want to see when you are there. I do not stay at the resorts there, I stay in Paris and take the RER to the park (40 minutes from downtown Paris). The resorts are pretty, but they lack the magic at WDW. They are themed nicely but are more the quality of a business-class hotel in the States, not the resorts at WDW. You can forget the pools -- they are filled to the gills with Russian tourists and their 18 kids, and they are LOUD - you think the pools around the value resorts get loud at WDW, it is nothing compared to the unsupervised idiocy at the pools at DRP.
Disney Village has nothing in it to see -- don't even bother unless you are staying in the resorts there. They are not comparable to the the Downtown Disney thing -- it is merely a series of buildings next to each other with two restaurants and a McDonalds. There are some small shops - nothing on the scale of anything in the US Disney entertainment villages. You will be sorely disappointed if you waste your time planning to spend any of it in the "Village". It's merely a "holding pen" to keep the resort guests busy after the parks close for an hour or two.
The parks themselves are prettier than any other Disney parks anywhere -- Disneyland Parc is stunning and as the poster above indicated, all of their E-ticket rides are far superior to the US versions. But Europeans don't go to Disney to "linger" over the parks, like we do in the US...they go in a clockwise direction, do each ride, then go home. Often by 3:00 in the afternoon, you can walk on the major attractions (the exceptions being Space Mountain II and Big Thunder Mountain). They also have much better use of Fast Passes so you can plan your day quickly around those.
I don't know when you will be there but summer is HORRIBLE at the parks - the crowds are horrendous - and Europeans don't really stand in lines - they just jostle their way into crowds around the entrances, hop the queu lines if they can, and the term "waiting in line" is merely treated as a "suggestion". During the summer, prepare for very long waits on all the major attractions. If you are there during the summer, go on a day that it is raining - the parks clear out, almost everything is indoors, and you will get to do more while there.
