Hermannplatz U-Bahn Station, Berlin 🇩🇪. Probably one of the easiest transfers between two subway lines (U7, U8); one short escalator between the two platforms.
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Wuhan Metro at Zhongnan Lu (中南路) and Hongshan Square (洪山广场) has a consecutive pair of transfer stations such that you can transfer cross-platform for *all* combinations. Hong Kong MTR does the same Prince Edward (太子) and Mong Kok (旺角站).

Jul 9, 2022 · 7:32 PM UTC

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Taipei Metro's Dongmen (東門) Station is another good example of a busy station with "typical transfers straight across" where the atypical transfers do require the escalator.