It certainly makes it easy, and for my mobile wallet it is much safer than a 4 digit code! I only keep a small fraction of a bitcoin on my phone, but that is still a fair chunk of change nowadays!
For Electrum I would like it as a 2FA. I use 2FA already, but if I lose my phone, or I don't have it with me, it means I have to restore my wallet from seed, which isn't ideal.
I would like to type in my seed as infrequently as is possible, in case of keyloggers or alike.