You have my absolute sympathy FenceFurniture! But believe me when there is no effective competition Bunnings are absolutely terrible. As stated by others, getting to the checkout to hand over your hard earned is more often than not the most painful part of the process - no checkouts open, all business conducted at the returns counter, queue a mile long and all the other staff wandering around like farts in a bottle. The only station that you can guarantee will be manned at Bunnings is the anti-theft, sorry, meet and greet, at the front of the store.
Having quite a number of family in the mountains between Springwood and Blackheath I can certainly understand your frustration though. If a Bunnings did open at Katoomba it would more than likely wipe out your Home Hardware in pretty short order and you would be back to square one, albeit with a larger range of products.