If he is a minimalist i am a maximalist lol, have above 100 apps and too many to list, but about half are games and fun apps, about 10 tools 10 media apps 10 widgets and the rest are various apps. As for often used or not i dont care that much, all apps that can work from the SD i have them there, which are about half of them. If after a while i see that i dont use some of them at all off they go.
Of the most valuable and most used for me are:
Titanium Backup Pro
File Expert
To Market
Easy Money
Memento Database
MoboPlayer
UberMusic
eBuddy
Google+
GoSMS
Go Launcher EX
Facebook
TweetCaster
Foursquare
Foodspotting
Skype
AdFree
NoLock
Optimize Tool
SugarSync
Toggle Settings
Opera Mini
Tapatalk
Angry Birds
Bejeweled
Mahjongg
Tetrs
Vexed
Quickpics
Adiko eBook
iMDb
Shazam
GoWeather
etc etc