WhatsApp is also really strong here in Germany and other parts of Europe. More of my friends are on WhatsApp than Facebook (only very few more though).
These numbers are going to drop significantly now. Everyone I talk to is unhappy about the acquisition and will switch to something else like telegram.
I'd say more than 99.9% of WhatsApp users haven't heard of Telegram.
WhatsApp users are mostly not early adopters like you and your friends. They are ordinary people, because WhatsApp is is a simple communication tool targeted to everyone. And that's why they keep doubling their user base.
Unless Facebook actually puts their logo on WhatsApp, hardly anyone would notice. The tech community is minuscule compared to the large number of non-tech people using WhatsApp.
The uproar in Spain about WhatsApp switching to $1 per year was huge, noisy and... emphemeral. Line got a lot of new signups for a few weeks, but the only person I know that still considers using Line today didn't even have WhatsApp back then (but, like everyone else, does have it now).
Also in the Netherlands. E.g. in June 2013, 75% of the smartphone users used WhatsApp daily. Moreover, more than three quarter of the Dutch citizens has a smartphone.
So, WhatsApp is definitely used in high-profit markets as well.
Singapore is a Smartphone country, but Whatsapp is pretty dominant there. (I didn't run into anyone who didn't use it as their primary messaging platform)
From my personal experiences, international countries that have smartphone adoption use Viber, and the feature phone countries use WhatsApp.