While I certainly don't consider myself a fan at all, and really only paid him any mind when his music would play on video or radio, even I feel the loss of this great talent; and I really appreciate David Bowie much more than I had thought I did. The Let's Dance era was what made the first and lasting impression for me, but I somehow feel that many may not consider that as his best work.
As with a certain character's death in Star Wars The Force Awakens, I feel like a family member has passed; because they've been such an organic part of my life due to my age.
What a loss; but his spirit and music certainly live on.
In fact, I think Lady Gaga is the living individual who probably comes closest to what Bowie has historically done. She certainly may not have a cult classic like Ziggy Stardust, but she is quite a multi-dimensional talent in the vain of Bowie.
RIP David, you gorgeous soul.