Firstly, I would like to apologise for the delay in answering this question. I haven't been on Sunniforum for quite some time now and it had left my attention that I had an unanswered question. Please do forgive me for the delay.
Originally Posted by OmarH
As for the Question.
1. Many Ahadeeth have come in regards to the Day of Judgement. There are by far many more Ahadeeth that mention the Day of Judgement to be severe than the ones that say it will be an easy task.
Therefore, there could be two meanings taken from this Hadeeth:
a. For those who were steadfast upon Salaah, who performed it correctly and the way it should be, they will be the ones that will find the Final Day as easy as offering their Salaah.
The question remains; what about the people who performed Salaah but did not offer any other good deeds?
The true effect of Salaah is that it stops a person from commiting any other sins:
“Verily Salaah stops one from shameless and evil deeds."
b. Another meaning that can be taken from this Hadeeth is that Salaah is a very 'hard' act for one to fulfil. Therefore, similarly so is the Day of Judgement a 'Hard' matter:
"Seek help in patience and prayer; and truly it is hard save for the humble-minded"
Another answer that can be given is that the Prophet Sallallahu Alayhi Wa Sallam mentioned this Hadeeth before he had the total revelation of the matter of the Day of Judgement.
Nevertheless, the matter of Qiyaamah is a very sever one as it has come in many Ahadeeth.
Following is a Link that outlines some of the verses and Ahadeeth concerning the Day of Judgement.