No. I don't think so. I saw plenty of brown-nosers among the elders... those trying to rise through the ranks. But among the average JW? No. I did not see much fawning. We were taught to believe that we were super important and everyone was watching us. Most people I knew were completely and overly arrogant. I'm still arrogant at times. I saw a lot of guilt as well. But I saw almost no fawning over other people.. The only people I saw being revered were the traveling overseers who had entertaining talks or people who came from other countries. I saw a lot more people avoiding each other.
I don't count the love-bombing as sycophantic behavior. I think that is just a natural reaction to having someone new and shiny in your tiny little bubble. People behave the same way in small towns except that they don't immediately show the new people love because they don't know if the new people are trust-worthy. In the JWs it is assumed that all new people are trustworthy and so love and joy is the obvious and acceptable response. Despite how creepy and cult-ish it is, it is also just really natural human behavior.
Maybe something has changed with the advent of the GB getting into the limelight, but I doubt it. Just because people behave well or are 'on their best behavior' when someone important to them is in town, that doesn't mean that they are sycophants.
A sycophant is a type of person, not a specific behavior. This means that if a person is a sycophant than they exhibit that behavior as a part of their personality not just situationally or on certain occasions. Consider the the type of people that Wormwood and Bellatrix Lestrange were in Harry Potter, the kind of person that C3PO is in Star Wars, even the kind of person that Effie Trinket was in Hunger Games. These are, very different, examples of sycophants. Brown-nosing is a current idea of the word, but it doesn't accurately describe what a sycophant is. While I knew some brown-nosers, I can't say that I knew any sycophants. So, no. I don't think that your average JW is a sycophant.