I'm the Luddite with just a landline, but that's not 100% entirely true. Both DH and I have tracfones that stay in our vehicles. We use them for emergencies only, although I will occasionally call him at home from my tracfone if I notice that it's recycle day and I know he's forgotten, for example. I don't know my cell number or DH's. I also use it to "buzz" DD at her dorm when I am there to pick her up- I just speed dial her cell number and let it ring twice, so she knows I am there. It costs us less than $100 a year for both DH's and my tracfone.
I will admit, we don't use the landline very much. I am not a "chat on the phone" kind of girl and often use the handset display or TV to screen calls; if I don't recognize the number, I don't answer. DH uses it to talk to his mom and dad, and I talk to my sister about once a month. Mostly, we use the landline to call in our takeout pizza order! We just really aren't phone people, either land or cell lines!