Yeah, over head filters (OHF) are still being used by many people... usually those with tanks that focus more on fishes.
For people with high-tech planted tanks with Co2 injection, having less water agitation and less surface exposure to air is preferable in order to retain as much of the injected Co2 as possible (in this case, the high density of plants are what aid in filtration and oxygenation instead), hence OHF are not so popular amongst that group of aquarists.
In addition, OHF covers the top of tanks and blocks the top down view, so for those with planted tanks who like an open top minimalist look (ie. ADA gallery tank style), they would prefer filters that can be hidden below and inside a cabinet instead.

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