I'm going to say that a big part of the equation is location. If you live in a larger city / area then I think culinary school is more beneficial. If you live in a smaller city / area then.. I'm not so convinced it's worth it, monetarily speaking.
The knowledge you will learn and be able to apply, the skill sets you will learn, and your understanding of ingredients after graduating culinary school will be amazing, but the big question is going to be, is it worth the money you paid.
You say you work in a restaurant, have you talked to your head chef, the owners, other line cooks? What did they say? Did any of them go to school? What about other chefs in your area, did they attend school?
The best information you could ever ask for.. is what you should be asking people in your area. I talked to to the chefs in my area and for me personally.. it wasn't worth it. The only culinary school within about 300 miles is a private college with less than stellar reviews, and it's yearly tuition was about $30,000. If there was a community college option close enough, I would probably have went to that without hesitation but.. that option wasn't available to me.
There is no doubt that you will learn amazing amazing things at culinary school, but will that knowledge set you back financially for the next 15 years? Sadly man, it all comes down to the mulah