That is true.... stock Android, especially from someone coming from a Samsung or HTC device, seems pretty sparse. Of course, there are a lot of people looking to simplify.
Which is funny about the Nexus 5.... there are almost two camps.... first are the people looking to get rid of the noise. Those people got sick of all the crap that Samsung, HTC, Verizon or AT&T load their phones down with.... they wanted a great phone that was untouched by such things. The Nexus 5 is prefect for those types of people... since they are cheap, blazing fast and you are not going to find a cleaner phone.
The second group... they couldn't give a flip about what anyone loads on their phones since they are ripping out its software guts the instant they take it out of the box. And since some of these phones are coming with baubles and bits that rely on proprietary software and limit their choices (like the S-Pen), getting a phone that doesn't have closed hardware bits is desired. The Nexus 5 is probably the most common 'reference' phone in the dev community.... between its price and it being first in line to get OS updates (meaning they can get custom ROMs at the newest Android MUCH faster)... for those people, the Nexus 5 is perfect.
But for everyone, it's a cheap, blazing fast and well built phone. It doesn't have the bells and whistles, but I've had a bunch of techy goodies over the years and I've found that I rarely end up using any of those cutesy features that they came with (aka MS Office syndrome).