I believe that my fish are fully capable of producing their own slime coat - that is an essential part of their nature. I am unaware of tropical rainforest stream banks being lined with dripping Aloe vera plants or of that being esential for the captive culture of fish, so I don't use it. I did not use it when I was younger, and saw reason to change when it suddenly became a hot item in dechorinators (long before chloramines were in common use) as a branding tool. To me the "need" for Aloe vera or other slime coat "enhancers" is a maketing need, not a fish culture need. Your dime, your choice.
For chlorine-only water, I age it. For chloramine-containing water I use Prime or Amquel.