My wife and I visited WOC in Dec 2011 on a family trip to Atlanta. I had visited the old WOC in 1999 and I remember it was less self-guided than its successor. The new WOC is only led by a tour guide for approxiamtely the first ten minutes and then you are on your own to explore. Unfortunately, the exhibits to explore are not uniquely engaging.
There is The Vault, which tells the tale of how the Coke formula was hidden and protected and copied, then finally they show you a vault. Obviously, the claim is that the formula is located in that vault - whether it is or isn't, who cares to see a metal vault?
You can walk through a mock bottling plant, but I dont think it was running when we walked through because it didn't seem like anything was happening.
There was a 4D movie about discovering the secret formula, which turned out to be YOU! So, basically, more Coke propaganda.
We were really looking forward to the exhibit on the collection of old Coke commercials, but very few were familiar (and we watched a lot of TV in the 80s and 90s!) and so even this was not truly gripping.
The most fun thing, of course, was the area for tasting the various products from around the world. Fortunately, we sampled about half early on in our visit and then the rest later on. Drinking all that soda can be rough on the gastro system! However, we thoroughly enjoyed the tasting.
We arrived around 10AM on a Friday and found the museum to be quite empty for the first half hour. We had no line for ticket or entry...but by the time we left around 1 PM, the line both for tickets and admission was HUGE!!! So - arrive early if possible!
My wife enjoyed the visit more than I did, so I guess is that your proclivity towards Coke and nostalgia will drive your enjoyment from the new World of Coke.
Tip: Get in early and see the Vault right away. Then go upstairs and drink some soda. Next, see the 4D movie. By now, the crowds are arriving but you have seen the most popular things already. Now stroll through the artsy exhibits, watch the commercials, then drink some more soda! You will have a great time and see everything with minimal waiting.