・That's a great idea=それは良いアイデアだ。
・Good idea=良いアイデアだね！
Good ideaとThat's a great ideaは同じ意味です。
・lazy=面倒臭い
（例）Stop being lazy and do your homework right now.
・can't be bothered＝〜をする気になれない。
（例）I can't be bothered to do the laundry today.
お役に立てれば幸いです。
It sounds like a good idea, but it would be way too much trouble for me. I wouldn't keep doing it for very long.
この場合、次のような言い方ができますよ。
ーIt sounds like a good idea, but it would be way too much trouble for me. I wouldn't keep doing it for very long.
「良いアイデアだけど、私にはめんどくさくて続かない」
it would be way too much trouble for me. で「私には面倒臭すぎる」と言えます。
ご参考まで！
日本 
カナダ 
