People use New Zealand honey — especially Mānuka — for a few reasons:
As part of holistic / natural-health lifestyle: combining honey with herbal extracts or bee-derived products (propolis, pollen) for overall wellness.
As a natural sweetener (in tea, food, etc.) instead of refined sugar
For health & wellness support: many use honey for throat soothing, immune support, digestion support.
For skin / external use: in some cases Mānuka honey products are used topically (skin creams, balms) for antibacterial and antioxidant benefits.