I can't remember Leather Doctor having a dedicated protector? I think he is all about making sure the leather is neutral for it to be protected? He has a product that has a very, very strong leather scent, but it's just a fragrance and not a protector. It just takes a couple sprays for the entire car to smell like a leather factory.
If you are looking for a product that makes the leather feel soft without any greasy feel you should try HD Protect. I helped formulate this product and wanted these characteristics to be followed due to my own personal must haves. Most products that soften the leather also leave a greasy residue due to the oils that it tries to displace. This product is water-based and will not do this.
http://www.youtube.com/watch?v=Jqq2L08d-2Q