Wow....I thought I had chimed in on this subject.....but I hadn't
Now for my two cents worth.
The simple answer to the question is...Yes...learning Greek is most certainly worth it. But I might add, that you only get out of it what you put into it. If you only study Greek for a little (1 year in school)...it's not worth much. I am a GReek major...I have completed all 4 years my school has to offer. A couple of years have passed since my last year of Greek. Now, I find myself being able to read my GNT almost as easily as my NIV....key word is
almost 
Hebrews and the Corinthian letters are much more tricky than the rest of the NT (I still do struggle with those)...but the gospels are like "See spot run". I guess what makes it better is that....there are things that you
could see in your english bibles without any Greek background....but if you are looking at it in the Greek it just kinda smacks you upside the head.
Case in point... I teach a bible study Sunday mornings at our church. My prep consists primarily of....reading the passage in Greek (we are in Ephesians)...then looking at the passage diagramed....and then going over the diagram with an exegetical outline. That prepares me to teach the passage to class. I see all of the intertexualities, exactly how the syntax meshes together, and what exactly the "main points" are that Paul is trying to communicate. If there are things that I am stuck on (Eph 3:10 still has me scratching my head) I consult a good commentary (Marcus Barth's commentary in the Anchor Bible is
outstanding) that can usually help me resolve tricky theological problems.
So....I guess I would say "Yes", but only if you are really willing to commit the time. A year or two is nice, but it will just get you reading. Four years is enough time for you to really start understanding how the language works and how to correctly interpret it.
IMHO what this world needs is more pastors that
really understand and read Greek...so if that is what you are eventually shooting for...I would encourage you even more.