I grew up with Bond films regularly on TV from a young age and there was always just a blur of many of the films. Besides the newer ones I was seeing in the theatre.
The notion that Goldfinger was the first true Bond film got into my head. That was where they figured it out. From Russia With Love was good spy film, but not quite Bond yet. As I got older, the films became more individually known to me, but for whatever reason, I just didn't watch Dr No with the idea that I wouldn't like it, It probably was aired the least as well. Literally all I knew of Dr No was that in Jamiaca a tour guide pointed to some docks and said that's where they filmed it.
I was probably in my late teens or early 20s when I got all the films on DVD and did my first complete watch-through. I was blown away with Dr No, really liked it and was confused about whatever I watched or whatever was said to me to make me think if wasn't a proper Bond film yet. There's truth to perfecting the formula in Goldfinger, but that didn't mean it was a proper Bond film or wasn't good.
Also, just a shout out to those DVDs and the documentaries of the making of the films. They were superb.
I think they still have the same making of documentaries on the blu-rays and the 4K of the Connery films.