Is an 18 inch screen really worth it?

I am looking to get a gaming laptop and want to know if a bigger screen is really worth it. I know Alienware and and Asus make an 18" machine, but it also seems like the Legion laptops are preferred. So is a bigger screen worth it, and if so, which would you recommend? I am looking to spend $3k or less.

Edit: My goal is to mainly play on the couch. I would like to take it on work trips as well. I am a bigger guy and don't mind the weight and typically try to get bigger bags anyway.

Edit 2: Thank you all so much for your opinions. I will keep checking and responding to posts, but just wanted to say thank you to you all for sharing. I hope this thread helps others as much as it helped me.