It's very doable to stay in Paris and ride the train to and from DLP.
Get there at least 40 minutes prior to listed opening time.
If you can afford it, try to stay on property so you can take advantage of morning EMH. The parks get really crowded, so that extra time in the AM should allow you to get in quite a few rides.
The fastpass system is the old paper fastpass system, so if you aren't familiar with it, get familiar with it. One thing I wasn't sure about was whether you can have FPs in both parks simultaneously -- the answer is YES! So if you're going to park hop, don't be afraid to grab a BTMR FP on the way out. The FP return window is only 30 minutes, so that makes it a little more difficult to plan your day.
Do not waste your time on the Toy Story parachute army guy ride. It is an extremely slow loading ride, and even if the line looks short -- it still takes forever -- and the payoff isn't that great. the ride looks like a lot of fun -- but it's really just a kiddie ride. The slinky dog ride is also not worth waiting more than 15 minutes for.
If you want to ride the crush coaster, you pretty much have to rope drop it.
Single rider line at Ratatouille works pretty well.
A lot of the rides are in French -- so it does make it hard to follow along with what's going on storywise. It was definitely weird to hear french pirates and french Tower of terror.
The park is much more similar in layout to
Disneyland as compared to Magic Kingdom.
Park hopping is pretty easy as the parks are pretty close together -- not as close as DL and DCA in Anaheim -- but still pretty close.
DLP is absolutely gorgeous theming wise. They did a phenomenal job.
I couldn't connect to any WiFi while I was in the park -- so plan accordingly.
I actually thought that pretty much all of the cloned rides were better at DLP -- IASW felt fresher/more vibrant. Tower of Terror is a clone of the California version.
Smokers, smokers everywhere. I literally have a picture of a guy smoking next to the do not smoke sign, while a CM was sweeping up cigarette butts.
People will cut in line without any shame. The queues are quite wide, so it provides plenty of options for people to just kind of meander their way past people.
I can't recommend any good food options -- we ate at the tomorowland QS and Earl of Sandwich. The QS place was pretty bad and EoS was merely OK.
If the park closes at 9:00 pm -- you can expect them to start closing down rides 30 minutes before. When they close the park -- they actually want you out of the park. It's nothing like at the US locations. i think the fantasyland closed an hour prior to the fireworks show when I was there in March.