Plenty of threads on this- just do a little searching.
I used to secondary, but don't anymore unless necessary to get a desired effect, e.g., racking onto fruit or wood.
My first couple of long primaries were just because I didn't have time to rack to secondary (or was just lazy) and figured I'd let it go and see what happened. The beers turned out great, so I kept doing it. Racking to secondary is time, effort, and a potential infection point- why bother if your beer will turn out just fine with only a long primary?
I routinely primary for a month these days and then bottle.
All this being said, there's no one "right" way to do anything in the world of brewing. Take this and all the other advice/info I'm sure you'll get on here into consideration... and then just do whatever you want to do! You'll make great beer either way.