My new Nexus 4 arrived today and being a diehard iOS user, I'm not sure where to begin. If anyone has their top 5 android apps they'd recommend I'd love to check them out!
I am also an iPhone convert. Went from a 4S to a Nexus 4 and it has been pretty great. Here are some apps I find myself using quite often:
K9 email client (not as user friendly as iOS, but it is very customizable)
Chrome (already mentioned by someone else)
Astrid tasks (I was in love with reminders, and this is the closest thing you will get)
Cerberus (Find my iPhone on steroids, although it takes some time to set up properly)
Team Viewer (for VNC purposes)
Slice (I order a lot of stuff online, and this is great for keeping all my orders organized with ZERO user input outside of initial setup. After that, it monitors your email)
Dropbox (for obvious reasons)
Plex (only if you have Plex Media Server on your computer)
MoboPlayer (great media player for Android. If you go to the homescreen while playing a video, it will make a popup and give you TRUE multitasking)
SetCPU (if you are rooted. Can help save battery)
Google Music (love having all my playlists up to date)
Google Wallet (don't use too often, but I have a couple times)
Power Toggles (I don't use the widget for it, I use it to always show controls in my notifications area and also use it do show my battery percentage. If you ever used SBSettings on iOS jailbroken, this is way better.)
I don't really use widgets, so I can't give too much advice there.