No AIDS would mean much less public health problems in Africa, which of course benefits many. As mentioned, the life expectancy of most African nations dropped like a rock in the 1990s, and AIDS was almost the entire cause of that. By now, South Africa and Kenya would have first-world level life expectancies (South Africa's public health system at the end of apartheid was surprisingly good, and to be fair without AIDS it might not have faced as many problems as it has.) and probably higher birthrates. This would grow both the number of South Africans and how health they are.
Does this benefit the post-apartheid SA economy? Undoubtedly. The hope in 1994 was that the end of apartheid and South Africa's very well developed infrastructure would lead to an economic explosion like Japan and South Korea in the 1960-80s. Change a few decisions by Mandela and Mbeki, and maybe a few of the great fighters live longer (specifically looking at Joe Slovo, who was white) and you could start to see the economic growth hoped for.
The wealthy South Africans put their cards on the table, which kicks growth into second and third gear. From there, foreign direct investment takes over. The proximity to Europe, America and Asia allows SA to become a manufacturing powerhouse, which provides millions of jobs.
By 2008, growth is around the double-digit mark, SA's economy has more than doubled its 1994 level. The whites and blacks who left in the 1980s and 1990s are coming home, and South Africa is being seen as a nation for the 21st Century.
Would be nice. In fact, I'm smelling a TL coming on......