Man why do these questions keep popping up when there's already a sticky thread explaining it for anyone that searches for it.
First just to clear things up...
Both the pink Premium Member level and the blue Jr.VIP level are both Donor memberships.
As nickk already pointed out, you should go read the sticky thread:
All about BHW Membership levels
Premium membership is available to new members and members with low post counts. With a Premium membership you get the ability to use links and images in your signature (for advertising), inbox capacity increased to over 500 PM, and a Donor icon next to your username
Jr.VIP membership is available after 60 days of membership and 100 counted posts. With a Jr.VIP membership you get everything the Premium members get, plus you get access to the hidden Jr.VIP forum.
So, if you want to use your signature for marketing on the forum, and don't want to wait till you meet the requirements of Jr.VIP then the Premium membership is a good option. Once you meet the 60 days/100 posts requirements for Jr,VIP (or you plan to meet them soon) then it really makes more sense to donate for Jr.VIP.
To answer the question in your thread title, "Is Donor Status worth it?", it jsut depends. If you donate to become a Premium member then it's really only worth it if you plan to market to other members here and don't expect to meet the Jr.VIP requirements any time soon. If you already do meet the Jr.VIP requirements then it's definitely worth donating if you want access to the hidden Jr.VIP forum.
If what your actually wondering is if the Jr.VIP forum itself is worth it... Well that depends on whether you're already getting benefit from the general forums.
If you don't already find benefit from the information in the general forums then don't expect to find any magic push-button methods in the hidden forum. On the other hand if you already understand and get benefit from the general forums then you'll probably be more than happy with the additional information available to you as a Jr.VIP.