The problem with druids is that it's a very narrow yet abstract fantasy with a lot of tools that dulls their core identity. This leads to them having a lot of minute abilities. Unlike the paladin or bard, who have narrow identities, druids aren't as prominent in secondary media. So, you feel pigeon-holed into a specific concept with little room for subversion or personalization.
This is compounded with all the small abilities druids, especially in modern D&D. Wild shape gives druids a bunch of fucking tools that are a pain to keep track of for both DMs and players. Now you have to keep track whether or not you've seen an animal and then you have to have those stat blocks on hand. This will lead you to not being able to see as many animals as often, since your GM might not want you to see an animal early enough. Oh, and this wild shape is just a second health bar.
Ironically, I feel like tearing wild shape's power out from the base druid might make them more popular. Make shapeshifting its own class or druid archetype. Rename them to shamans as well, which gives a more broader concept than Celtic priests and soothsayers.