"Free Beer" has it right. I grew up during this era in high school and college and you could name the top guys. They were like stars on the ESPN Running & Racing show.
A lot changed from about 92-96. Look up the qualifying standards for the 1991 IAAF World Championships (the year Spence won the bronze in the marathon). Morceli (1500m) and Kiptanui (Steeple/5k) were about the most dominant guys in their events, but guys could still dream about making national teams and competing well internationally.
The world records in the 3k/5k/10k were still mortal and Bob Kennedy would've been a world record-holder in the 5000m only a couple seasons earlier. People like Solinsky, Tegankamp, Ritz, Hall, Mottram, etc. would have been rock stars with their PR's. Then somewhere around 94-96 EPO hit the scene big-time mixed with the huge influx of East Africans and almost overnight a lot of individuals were gone that had been well-known identities in the sport. The identity of the sport changed rapidly and the gap between the competitive runners and hobby joggers became as wide as the ocean.
Sure you had more and more people participating in road races, but you almost completely lost the second tier development guys in the 90's. In the 2000's that depth started to come back due to the efforts of personal coaches to make it happen (people like Hanson's and the clubs, etc.).
Right now the US has about as much depth as ever on the track when you look at the top 10-20 lists yearly over the past decade, but the African countries have flooded the entire sport and not just from Kenya and Ethiopia, but most of Africa and many become citizens of other countries as well.
I remember an interesting conversation in 2008 when Nick Willis medaled in the 1500m in Beijing when someone pointed out that John Walker won the gold in 1976. But there was nowhere near the world-wide depth of guys racing at that level then and Walker held the world record in the mile. Willis broke Walker's national record for 1500m and in 2008 Willis's best time for the season only placed him 19th on the world list. That shows how many guys in just that one event had a shot at an Olympic medal from that year alone.
There have always been great runners in different eras, but the depth is now beyond any other time in the sport. Even in the US college system at all NCAA I, II and III divisions there is more depth then ever with more countries represented. Heck, a 13:37 5k didn't even score a point at the DI Indoor Nationals last weekend.
...and the sport rolls on.