It's not more or less enjoyable, just different. The biggest change is nearly what you suggest: that there is not so much anticipation anymore. In college it is hard to divorce the high-school-isms of "running leads to something" from the hobby-jogger "running is something you do". You'll have to view it as just something you do sooner or later...
You can build a similar sort of anticipation with a good club. You wont spend hours hanging with "the boys" as you probably used to, -- but there is something quite meaningful about waking up to see a running buddy / friend or two most mornings. Seeing yourself get very fit for the specific demands of a race is still just as fun and on an individual level what it is all about. Building a community around a running club is great too, -- as long as no one tries to replicate "their college days". In a word, the best thing to do is accept that it will be different, and move on.
For various reasons people transition to longer distances post college. There is no need to rush into this, but this is a great way to maintain enjoyment. At any level, preparing for your first marathon is a adventure like nothing else.
In all I'd say its been slightly more enjoyable, but both literally and figuratively your mileage may vary