That's probably a pretty big misrepresentation of what happened.
1. Inner city and inner east prices sky-rocketed in 09/10.
2. There was a slight dip in 11/12.
3. Current inner city/inner east prices are again well above 09-12 and competition is generally intense, especially among the inner city ring, ie the 6-7 suburbs surrounding the CBD (Carlton, Nth Melb, Parkville, East Melb etc) and suburbs adjacent to those in the east (eg Richmond, Hawthorn, Kew etc)
4. This "boom" has flowed on to some outer east areas (eg Box Hill) but generally has not seen the poorer areas run yet (eg unheard of suburbs like Forest Hill, or western fringes like Werribee, Altona etc)
In short, the market so far is only strong enough to support a rampant run for prices of good properties in good areas in good locations. Any property missing any of those 3 features may still struggle, pass in, not attract sufficient interest.
Which of course leads the interesting the question, do you take the risk now and buy in those middle ring areas? Personally I never invest in those suburbs because, as this market as proven, good locations close to CBD will always flourish ahead of the rest of the greater Melbourne market and flourish alone if it needs to, but if things pick up sufficiently across the broader market maybe those places are at the bottom now and one could enter.