Better transition animations in premiere
Red Giant Universe has the support you need.

Part of the video transitions included with Universe that might be useful to you:


Swish Pan/Slide: can create a nice slide with motion blur support and easing
Fade In: creates sort of a zoom effect with motion blur support and
easing.


Also has other transitions like Zoom Blur, Fold .etc. all with motion  blur support and easing.

If you are looking for some free presets I'm not sure about slide or wipe. But Chung Dha has some nice presets. They are keyframe based in Premiere, but you can modify them (but its not as drag and drop as Universe).

You can check them out here: http://www.chungdha.nl/?cat=129

Specifically the last two, namely, Smooth Transition Presets and Motion blur with transform effects.

He also has a tutorials on usability in each transition page.