It is still somewhat effective. I have one page on my website that has my email address on it. That email address is unique to that page and I don't use it elsewhere. That page:
- Doesn't use a
mailto: link (you have to copy and paste the email address from text on the page)
- Is disallowed by
- Isn't linked from my other pages (although it does have at least one external link after 15 years)
I still get zero spam at that address. How much of that can be attributed to the JS obfuscation compared to the other protection measures is impossible for me to know.
I would not recommend putting all your team members email addresses on your website with obfuscation. Even if bots can't read the emails, you don't want anybody to be able to copy all the email addresses by hand and email your entire office.
I'd recommend installing contact form software on your website that allows email to be sent to any of your team. I wrote a free, open-source, contact form that you can use. There are also good contact plugins for most content management system such as Contact Form 7 for WordPress or the Contact module for Drupal.