Decent exposure decreases coupling in your controller and views. Draper helps you stop writing those messy helpers. I find forcing myself to decorate every object a good practice - we call this a 'decent decoration'

application_controller.rb

class ApplicationController < ActionController::Base
  extend DecentDecorate
end

decent_decorate.rb

# you need a 'gem "draper"' in your Gemfile for this to work 
module DecentDecorate
  
  def decorate(name, klass = nil, &block)
    klass = "#{(klass || name).to_s.classify}Decorator".constantize 
    expose(name){ klass.decorate self.instance_eval(&block) }
  end

end

users_controller.rb

# sample controller
class UsersController < ApplicationController
  # this will raise an exception unless you define UserDecorator with draper 
  decorate(:users){ User.all } 
end

This is just a hack - if you need something more sophisticated you c'd try a gem my colleague created: https://github.com/netguru/decent_decoration