You never say that you become good at programming.

You let other people in the field say it. And that happens when it becomes accountable. For some it happens early in their career. For others, entire careers end and the words have never been said.

Humility and a desire to continually improve is, of course, essential in everything in life. But false humility - eg spending 52 years doing something and refusing to recognize some degree of skill - is just as bad as the lack of it. (I'm not saying the original commenter said this, but rather the people who responded in this vein)

And I say this while thoroughly enjoying a quote by one of the comedy greats, George Carlin, where he was quoted a legendary cellist, Pablo Casals, who kept practicing daily into his 90s, saying "I'm beginning to notice some improvement".

Recognizing your skill while also recognizing (perhaps even immense) potential for improvement are not mutually exclusive.