I have found using these forms have multiple advantages to using the good old pieces of paper into a bowl!
The first advantage is that have you ever noticed people seem incapable of writing clearly their email / contact details? When I send follow up emails I have so many bounced emails that start to wonder if it's me!
Secondly, when you collect the email like this you can import the information in to something like Mail Chimp or another contact software to send follow up information. Sweet!
Lastly, everyone these days is used typing on their cell phones. they are used to the key positions... this comes naturally to them and I find more people actually enter when I do this electronically.
Here's a short video on setting your Google form up...
Open the video in YouTube for best view and click HD in right hand corner :-)