The best replacement for follow focus is rack focus.

The best alternatives to follow focus are rated as following:
★★★★★  rack focus

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Speaking about follow focus, one probably shouldn't forget about steadicam.

Other search terms related to follow focus and their ratings are:
★★★★★ steadicam
★★★ glidecam
★★ 50mm 1.8
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Google Trends

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follow focus
rack focus