If I actually cared about the Government breaking into my encrypted files I'd be using a One Time Pad. It might be cumbersome, and it might flag it as actually important info, but if I really didn't want someone to have the possibility of breaking it then only a encryption method that cannot be broken with any amount of processing power will do. However, I don't have any need to worry about some trivial thing like are they looking at me today. I don't have that kind of secret to hide.
You should always be worried about the government breaking into your encrypted files.
There is only 1 group in this country that can legally torture you and put you to death. Only one group that actually does that very thing on a daily basis.
Irrelevant of their current laws and practices, it's in your best interest to protect yourself from their prying eyes.
You've no idea what you're doing today that will be illegal tomorrow. Every device I own has some degree of encryption. Will that protect me if they target me directly? Probably not, but I certainly am not going to make it easy for them if it comes to that. Decent encryption isn't that hard, and just takes a few minutes of your time.