I dislike voicemails too, more out of my own problem with being impatient than anything else. In the words of Daniel Tosh, "I can't delete you fast enough." This stems more from people who leave pointless (IMO) voicemails such as, "Hey, you're not here... uh... call me back... yeah." If you must leave a voicemail, make it count.
On the other hand, my mother has been known to call my phone repeatedly when she knows I am in the middle of teaching the children (they do learn) and leave NO messages. 4-5 phone calls in the space of an hour with no message makes me think there's a massive emergency, I panic, take a minute to call her back, and I find out that she just can't figure out how to delete an app from her iPad or something like that.
Honestly, I know text can be a pain, but it certainly is convenient. "Hey honey, mom here, call me when you get a chance... not urgent." I can glance at this while doing something else.