I mostly used the Neem as a foliar spray. Hadn't had problems with slugs until this year. The cost of Neem, for an every five day spray on all my lilies made it so that I didn't too wet the soil. The directions state that you can, but part of me also worried about my already wet conditions and making them worse by adding more water to them.
That said, it certainly seems like it could help.
Your observation about bees is an interesting one. The same is true for humming birds, don't you think. But maybe that is just the color difference. 'Pearl Lorraine' was the one I was speaking about above, with the "glue". The very first flower that opened had nice useable pollen....the rest was junk. Sad in that it was my favorite of the Pearls and I had all sorts of plans for it