They still get built. Most of the time where money isn't as tight, any major traffic flows are accommodated by directional ramps. Like the ramp being maintained/rebuilt at 59N/101. CCW/101 interchange has a future directional (or systems) ramp from WB CCW to SB 101 planned. Ideally you would have directional ramps at all major interchanges going in every direction. Obviously cost prohibitive. So loop ramps are a compromise of cost vs. level of service. For the most parts loops serve their purpose just fine.
In the USA, unless you're on the Interstate, most state or civic freeways have large numbers of cloverleafs. China and their massive freeway projects, and they are extremely massive projects, has a large amount of stack interchanges. But they do build cloverleafs and all the rest.
On a side note, China's trunk freeway system went from 0 km of roadway in 1988 to 111,000 km in 2014. Unreal.. They've laid more concrete in the last 3 years, than the USA has ever used for everything they've built. roads, buildings, etc. Unreal.
http://en.wikipedia.org/wiki/Expressways_of_China
Interchange hierarchy pretty much goes like this:
Full systems interchange (either stack or full blown spaghetti looking ramps)
Partial systems/cloverleaf
Cloverleaf
Parclo/Trumpet
Diamond