Lifestyle tips

Try adding in vanilla and something sweet like corn syrup. It will make it taste better and add in more calories

Mix it with sugar and milk

Add a shot of some sort of flavoring syrup like Torani or Grenadine.

How does coffee creamer compare to heavy cream?

I cook it into my foods (taking the place of regular milk). However, since I work at a Starbucks, I have been using it to make my free drink. They mix really well into fraps

Have to echo the general advice, use heavy (or double) cream in stuff rather than drink it.

My wife when she was still in to gaining would have it in her morning latte and evening cocoa and would top up each full fat milk with it in a 1:3 ratio cream to milk.

Again as previously mentioned: pasta sauces, vegetable soup (carrot and cilantro/ leek and potato/ tomato/ chowders).
Summer deserts like Eton mess or pavlova are easy to make and are just merangue, fresh fruit, sugar and whipped heavy cream.

Use the cream to add the calories to things, gaining should be enjoyable in a gastronomic way.

I would just give heavy cream a chance, I think you will find that it grows on you. You'll get use to it