Drobiazko/Vanagas missed 2003 and 2004 too. They basically retired in 2002 and decided to comeback for the Olympic season in 2005-2006.
Albena Denkova went to 15* Worlds: 4 with Hristo Nikolov (1992-1995) and 11* with Maxim Staviski (1996-2007). *She made Worlds in 2000 but had to withdraw after a collision with Peter Tchernyshev during the practice before the FD.
Ooh yes, my bad. I do admire how D/V managed to compete in five Olympics. And had a pretty successful show career too. Anyone know if they're still skating?
Looking back, it seems like Albena could have done at least one or more worlds too, had Maxim not had his issues.