As a 30 year old guy who has gone back into his old childhood Lego sets recently, as well as recently bought himself some new ones I uh, feel sadly qualified to comment on this story. My recent purchases were one LOTR set, and a Lego City set. In response to the lack of "creativity" in these sets, it's not the sets that have gotten less creative. It's the engineering in the brick placement amongst everything that has gotten better.
If you compare the brick selection and design of say, a 2012 LOTR set vs my early 90's Pirate sets you can easily see this. The 2012 sets use a number of small, angular pieces from what I've noted, that fit together in creative ways that the early 90's sets could only dream of. The pieces in question in the 2012 sets did indeed exist in the early 90's set, so it's not a case of simply making "less flexible" pieces.
You can tell that the designers of these sets have gotten really, really good at their jobs, in no doubt likely as a result of the difference in computing power between the early 90's and now. To suggest that the sets have gotten less "creative" is asinine. Have we gained more themed and licensed sets? Absolutely. However, the pieces they are equipping these sets with are simply fitting together better and looking more streamlined. You've still got your 4x2 bricks, your 3x3 plates, there's just less usage of them as the primary shape of a vehicle/building, and they are enhanced by the smaller 1x2 45 angle bricks say that really help bring out the details in the design.
In the end, they're still freaking Lego you can put together any way you want. It's simply the brick selection has changed for the better.