I love DLP, but if you're from the US, I don't think it's worth flying all the way over (it's a long flight!) to Europe just for DLP. A combined trip to Paris and DLP (or combining with another European city) is a different story. Were you thinking of just DLP or DLP as part of a European vacation?
Overall, if you're from North America and want a vacation in just Disney, I'd stick to a trip to WDW. But if you want a vacation where Disney is part, but not all, of the magic, then DLP is a great idea.