I tend to side with you from my observational standpoint. But my Whitburn bible of choice (The Billboard Book of Top 40 Hits), which compiles stat points for singles in terms of chart longevity as well as peak position, ranks the artists of the '80s as follows:
1. Michael Jackson (1,944)
2. Madonna (1,878)
3. Hall & Oates (1,801)
4. Prince (1,679)
5. George Michael/Wham (1,631)
and of those 5, Dave's record more or less:
MJ: He plays "Billie Jean" & "Beat it" in '83 and nearly nothing else, outside of HFH sets, unless you count "Rock With You" as '80 rather than '79 (not to mention never playing sister Janet -- for shame!)
Madge: as stated by mshray
H&O: Dave's done a decent job of rehabbing them as far as the Fogheads who also used to hate ABBA are concerned.
Prince: we've recently gotten several post-'84 beakouts by the Purple One, so there's hope there.
GM: you gotta have Faith-a, Faith-a, Faith-a!