Al Anon isn't the same as AA, AA is for alcoholics and Al Anon is for the friends and family of alcoholics.
I've been in AA for about 5 years now, and honestly, my take is that it is what you make of it. Yes, the founders were patriarchal and religious. However, you don't have to be religious to get help from it. The most powerful aspect for me has been listening to other people's stories and being able to talk frankly about struggling with addiction to other people who have been there. Yes, there are some toxic people in AA, but that's true of any group with open membership. It's not a cult, whether and how often you want to go to meetings is entirely up to you. The honesty and vulnerability that people regularly demonstrate when talking about their lives are very moving.
Some people in AA think it's the one true path to sobriety, I disagree. There are lots of tools for recovery out there and AA is just one. It won't suit everyone, but for me it was a lifeline. Where I live, there are loads of meetings and you slowly get to know the ones that suit you. I tend to avoid the big meetings that are more 'by the book' and go to the smaller, quirkier meetings.
I also like NA because its vocabulary is more secular than the AA vocabulary. NA sees alcohol as just another drug, so alcoholics are welcome at NA meetings.
AA has been around so long that there are plenty of more nuanced and secular versions of the 12 steps, as people have said. A Woman's Way Through the 12 Steps, for example, is a feminist take on AA. It acknowledges that the discourse of powerlessness is not v helpful to women, whose self-esteem is often low to begin with, so redefines powerlessness in a more empowering way (ha). To me, powerlessness means that I can't control what other people do -- instead of pouring all my energy into making them happy, I can look after myself. Another excellent secular version of the 12 steps is in Gabor Mate's extraordinary book about addiction, In the Realm of Hungry Ghosts.
Personally I attend AA meetings but have read a lot of other literature about addiction on the side. Other people in AA are quite religious and stick to the AA Big Book (which I find old-fashioned and patriarchal, but to each their own).
If your friend has been going to AA so long, he has likely built up a support network that is very valuable to him. But if the meetings are making him unhappy, that's a different story. Maybe he needs a different sponsor (does he have a sponsor?) or a different approach to recovery. Only he can answer that question.