How topical! I went to Disneyland Paris with the family last Sunday - just for the day, we spent the next day in Paris itself.
We had an epic 11 hour drive from S Wales to Dover - the M4 was closed and the whole of the SE was snarled up, seemingly - so we missed our ferry by 4 hours and booked into the Premier Inn in Dover having rearranged the ferry for early the next morning.
On Saturday, a leisurely drive down, used a combination of toll roads and normal roads. The toll roads roads cost about 20 euros in total each way, were clear and we travelled constantly at the speed limit, 80mph. Huge contrast to travelling in this lovely congested country!
We stayed in a Campanile Hotel - not recommended - on the edge of Paris.
Disneyland on Sunday! 15 euros to park. We spent 10 hours there, went around the whole of the main park - not the Studio one, although we had tickets for both. My kids, 3 and 6 years old, loved it. I enjoyed the rides despite hating the Disney brand. Queues were about 40 minutes, at the longest, for the main attractions. We ate at a burger place for lunch, about 30euros for McD quality food for 4. There seemed to be better food there, but with main meals costing 30euros each we weren't too interested!
All of us went on Thunder Mountain, the roller coaster, several times. A first for my 3 yr old and she loved it and was just about tall enough.
There is plenty to do, plenty to see. The shops are expensive but you don't have to go inside them. Thinking back, you don't actually need to spend any money at all once you are inside the Park, but they seem to discourage picnics.
I wouldn't object to returning, but could only cope with a day. I don't understand how people spend more that that there. The constant loud, insistent Disney music was the worst thing. Other than that it feels very much like any other theme park.
After spending a day in Paris, we drove back, caught the ferry and got stuck in traffic on this side yet again. Of course.