Really? Do they have monitors in hotel rooms? This is just plain silly.
I never said that they have monitors in hotel rooms, but you're under scrutiny the moment you get onto property both by guards in uniform and in plainclothes. The thing about terrorism is that Disneyland would be a silly target from a terrorist's risk/reward standpoint. First, odds are the terrorists wouldn't be successful, because of the security layers surrounding Disneyland, and if so, damage would be minimal (relatively speaking) if isolated to a hotel room bomb which is what I assume you are referring to.
A car bomb at a Walmart on Black Friday in Podunk USA would be much more effective - first, it would probably be successful as it doesn't have the layers of security a place like Disneyland has. More importantly, it sends the message terrorists want to send - nobody is safe anywhere at anytime. Imagine how the economy would be crippled if people were scared to go to the malls at the start of the holiday shopping season? Most targets of terrorism are soft targets, look at the Paris attacks - the successful ones were at nightclubs and cafes with minimal to zero security, at places 100% of the population goes to any given day of the week. Disneyland is not one of those places.
So, to address the OP's concerns, Disneyland is safe for a number of reasons - it has good security and many layers of it, but perhaps most importantly, it doesn't make sense with the "logic" (I use the term loosely) of terrorism which is to make the general population scared to go about on their day to day business.
Fear is fear, irrational or not, and if the OP is scared, these feelings are valid and real. But I would have no reservations taking my family to Disneyland whereas I would be wary going to malls and shopping centers this holiday season.