Using https is an important security measure even though we do not care about it much when it comes to emailing. Gmail introduced an option to always use https but still it was not the default setting that allow user to use http. Its time to default https as need of security is increasing.
Https encrypts your email as it travels between web browser and Gmail servers. It will stop middleman attacks on your data. Hackers can easily snoop plain data (not encrypted) travelling between web browsers and servers.
Gmail team is rolling out default https for everyone. However, you can jump into the Gmail settings and switch it to always use https. You are sending sensitive information via Gmail. How many times you have send logging information, credit card details, and order information through email.
So switch to https before its too late.
Official Gmail Blog: Default https access for Gmail
