I suppose it depends where in Cape Town you lived. I was fortunate to have grown up in the suburb of Milnerton, which is just down wind of the prevailing South Easter wind from Ysterplaat. I also attended Holy Cross Primary School in Brooklyn, which is just over the fence from Ysterplaat!
My childhood days were filled with Wasps, Allouettes, Pumas, Super Frelons, Dakota's and the like from the Airforcebase. we were also on the flightpath of the daily Transall, Dakota and C-130 shuttles up north. We also frequently saw Impala's and Harvards from Langebaan, as well as the ocasional Mirage and later Cheetah whenever they were at Langebaan. Occasional sightings were made of the DC-4, and I once saw a Vampire as well!
Many a languid summer weekend was spent on my parents garage roof with binoculars..... and when an airshow was in the offing, such as the big ones in 1980 and 1982, we basically spent the entire week up there watching the rehearsals!
I saw the Mercurious many times, as well as the Viscount occasionally. The Mercurious were particularly noisy aircraft. It is why i have loved aircraft from an early age.
We were luckier than you Southern Suburb types.
EDIT: The most common plane in the sky was definitely the Albatros. Evelyn the Spitfire made an appearance every now and then. Most magnificent was watching the Shackletons taxy along the fence at Ysterplaat by Holy Cross during break times. They were almost within arms reach!! I later heard they were based at DF Malan due to the runway length ...... yet these were operational Shacks with flightcrew dressed in their flight gear. They would often take off from Ysterplaat. This happened quite regularly. Does anyone know why they came to Ysterplaat?